$BKU
BankUnited, Inc. Stock $bku

$bku Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000150400824000006 Filed on February 20, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$5.499M	$483.2M	$21.68M
YoY Change	-0.83%	20.35%	-7.35%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development	$20.32M		$79.98M
YoY Change	-6.49%		3.74%
% of Gross Profit
Depreciation & Amortization	$17.21M	$17.06M	$74.06M
YoY Change	-11.41%	-14.21%	-4.59%
% of Gross Profit
Operating Expenses	$20.32M		$79.98M
YoY Change	-6.49%		3.74%
Operating Profit
YoY Change
Interest Expense	$266.6M	$266.0M	$983.8M
YoY Change	25.44%	67.9%	209.86%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$67.21M	$24.19M	$237.1M
YoY Change	-6.45%	-70.43%	-36.8%
Income Tax	$19.23M	$3.374M	$58.41M
% Of Pretax Income	28.61%	13.95%	24.64%
Net Earnings	$47.30M	$19.88M	$175.1M
YoY Change	-10.56%	-68.28%	-37.44%
Net Earnings / Revenue	860.16%	4.11%	807.61%
Basic Earnings Per Share	$0.64	$0.27	$2.39
Diluted Earnings Per Share	$0.64	$0.27	$2.38
COMMON SHARES
Basic Shares Outstanding	74.37M shares	74.38M shares	73.33M shares
Diluted Shares Outstanding	73.64M shares		73.52M shares

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$421.2M	$588.3M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$329.0M	$371.9M	$371.9M
YoY Change	-37.48%	-31.1%	-31.1%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$35.11B	$35.76B	$35.76B
YoY Change	-5.6%	-3.42%	-3.42%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses			$72.39M
YoY Change			-10.53%
Deferred Revenue
YoY Change
Short-Term Debt		$0.00	$0.00
YoY Change		-100.0%	-100.0%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities			$72.39M
YoY Change			-10.53%
LONG-TERM LIABILITIES
Long-Term Debt	$709.0M	$709.0M	$709.0M
YoY Change	-1.64%	-1.66%	-1.66%
Other Long-Term Liabilities	$823.9M	$821.2M	$821.2M
YoY Change	15.37%	9.43%	9.43%
Total Long-Term Liabilities	$1.533B	$1.530B	$1.530B
YoY Change	6.83%	4.0%	4.0%
TOTAL LIABILITIES
Total Short-Term Liabilities			$72.39M
Total Long-Term Liabilities	$1.533B	$1.530B	$1.530B
Total Liabilities	$32.47B	$33.18B	$33.18B
YoY Change	-6.46%	-4.07%	-4.07%
SHAREHOLDERS EQUITY
Retained Earnings	$2.677B	$2.651B
YoY Change	3.54%	3.9%
Common Stock	$748.0K	$744.0K
YoY Change	0.54%	-1.72%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.640B	$2.578B	$2.578B
YoY Change
Total Liabilities & Shareholders Equity	$35.11B	$35.76B	$35.76B
YoY Change	-5.6%	-3.42%	-3.42%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$47.30M	$19.88M	$175.1M
YoY Change	-10.56%	-68.28%	-37.44%
Depreciation, Depletion And Amortization	$17.21M	$17.06M	$74.06M
YoY Change	-11.41%	-14.21%	-4.59%
Cash From Operating Activities	$66.50M	$63.80M	$657.5M
YoY Change	-52.96%	-373.57%	-49.18%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities	$487.5M	-$168.6M	$29.99M
YoY Change	5297.36%	-64.51%	-27.55%
Cash From Investing Activities	$487.5M	-$168.6M	$980.6M
YoY Change	406.62%	-64.51%	-146.24%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-721.1M	301.3M	-$1.622B
YoY Change	-869.05%	-12.67%	-249.62%
NET CHANGE
Cash From Operating Activities	66.50M	63.80M	$657.5M
Cash From Investing Activities	487.5M	-168.6M	$980.6M
Cash From Financing Activities	-721.1M	301.3M	-$1.622B
Net Change In Cash	-167.1M	196.4M	$15.64M
YoY Change	-150.42%	-227.98%	-93.93%
FREE CASH FLOW
Cash From Operating Activities	$66.50M	$63.80M	$657.5M
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023	us-gaap	Interest Expense InterestExpense	983777000	usd
CY2022	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	912960000	usd
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-67119000	usd
CY2021	us-gaap	Gain Loss On Investments GainLossOnInvestments	6446000	usd
CY2021	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	122143000	usd
CY2022	us-gaap	Payments To Acquire Loans Held For Investment PaymentsToAcquireLoansHeldForInvestment	2283134000	usd
CY2023	us-gaap	Proceeds From Loan And Lease Originations And Principal Collections1 ProceedsFromLoanAndLeaseOriginationsAndPrincipalCollections1	377863000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	74493898	shares
CY2023	us-gaap	Weighted Average Number Of Shares Common Stock Subject To Repurchase Or Cancellation WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation	1168004	shares
CY2022	us-gaap	Weighted Average Number Of Shares Common Stock Subject To Repurchase Or Cancellation WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation	1224568	shares
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	73325894	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	78807788	shares
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.39
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.55
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.52
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	279896000	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	408993000	usd
CY2021	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	585000	usd
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0001504008
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherAssets
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherAssets
CY2023Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilities
CY2022Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilities
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherAssets
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherAssets
CY2023Q4	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#LongTermDebtAndCapitalLeaseObligations
CY2022Q4	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#LongTermDebtAndCapitalLeaseObligations
CY2022	us-gaap	Operating Lease Income Comprehensive Income Extensible List OperatingLeaseIncomeComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#SubleaseIncome
CY2021	us-gaap	Operating Lease Income Comprehensive Income Extensible List OperatingLeaseIncomeComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#SubleaseIncome
CY2023	us-gaap	Operating Lease Income Comprehensive Income Extensible List OperatingLeaseIncomeComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#SubleaseIncome
CY2023	us-gaap	Direct Financing Lease Income Comprehensive Income Extensible List DirectFinancingLeaseIncomeComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#InterestAndFeeIncomeLoansAndLeases
CY2021	us-gaap	Direct Financing Lease Income Comprehensive Income Extensible List DirectFinancingLeaseIncomeComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#InterestAndFeeIncomeLoansAndLeases
CY2022	us-gaap	Direct Financing Lease Income Comprehensive Income Extensible List DirectFinancingLeaseIncomeComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#InterestAndFeeIncomeLoansAndLeases
CY2023Q4	us-gaap	Hedged Asset Statement Of Financial Position Extensible Enumeration HedgedAssetStatementOfFinancialPositionExtensibleEnumeration	http://fasb.org/us-gaap/2023#LoansAndLeasesReceivableNetOfDeferredIncome
CY2023Q4	us-gaap	Hedged Asset Statement Of Financial Position Extensible Enumeration HedgedAssetStatementOfFinancialPositionExtensibleEnumeration	http://fasb.org/us-gaap/2023#LoansAndLeasesReceivableNetOfDeferredIncome
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Entity Registrant Name EntityRegistrantName	BankUnited, Inc.
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-0162450
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	14817 Oak Lane
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Miami Lakes
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	FL
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	33016
CY2023	dei	City Area Code CityAreaCode	305
CY2023	dei	Local Phone Number LocalPhoneNumber	569-2000
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	1582728768	usd
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	74371130	shares
CY2023	dei	Auditor Name AuditorName	Deloitte and Touche LLP
CY2023	dei	Auditor Location AuditorLocation	Miami, FL
CY2023	dei	Auditor Firm AuditorFirmId	34
CY2023Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	14945000	usd
CY2022Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	16068000	usd
CY2023Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	573338000	usd
CY2022Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	556579000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	588283000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	572647000	usd
CY2023Q4	bku	Investmentsecuritiesrecordedatfairvalue Investmentsecuritiesrecordedatfairvalue	8867354000	usd
CY2022Q4	bku	Investmentsecuritiesrecordedatfairvalue Investmentsecuritiesrecordedatfairvalue	9745327000	usd
CY2023Q4	us-gaap	Investments Investments	8877354000	usd
CY2022Q4	us-gaap	Investments Investments	9755327000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	310084000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	294172000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	24633684000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	24885988000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Net Reported Amount Covered And Not Covered LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered	24430995000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Net Reported Amount Covered And Not Covered LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered	24738042000	usd
CY2023Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	318459000	usd
CY2022Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	308212000	usd
CY2023Q4	bku	Operating Lease Equipment Net OperatingLeaseEquipmentNet	371909000	usd
CY2022Q4	bku	Operating Lease Equipment Net OperatingLeaseEquipmentNet	539799000	usd
CY2023Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	77637000	usd
CY2022Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	77637000	usd
CY2023Q4	us-gaap	Other Assets OtherAssets	786886000	usd
CY2022Q4	us-gaap	Other Assets OtherAssets	740876000	usd
CY2023Q4	us-gaap	Assets Assets	35761607000	usd
CY2022Q4	us-gaap	Assets Assets	37026712000	usd
CY2023Q4	us-gaap	Noninterest Bearing Domestic Deposit Demand NoninterestBearingDomesticDepositDemand	6835236000	usd
CY2022Q4	us-gaap	Noninterest Bearing Domestic Deposit Demand NoninterestBearingDomesticDepositDemand	8037848000	usd
CY2023Q4	us-gaap	Interest Bearing Domestic Deposit Demand InterestBearingDomesticDepositDemand	3403539000	usd
CY2022Q4	us-gaap	Interest Bearing Domestic Deposit Demand InterestBearingDomesticDepositDemand	2142067000	usd
CY2023Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	11135708000	usd
CY2022Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	13061341000	usd
CY2023Q4	us-gaap	Time Deposits TimeDeposits	5163995000	usd
CY2022Q4	us-gaap	Time Deposits TimeDeposits	4268078000	usd
CY2023Q4	us-gaap	Deposits Deposits	26538478000	usd
CY2022Q4	us-gaap	Deposits Deposits	27509334000	usd
CY2023Q4	us-gaap	Federal Funds Purchased FederalFundsPurchased	0	usd
CY2022Q4	us-gaap	Federal Funds Purchased FederalFundsPurchased	190000000	usd
CY2023Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	5115000000	usd
CY2022Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	5420000000	usd
CY2023Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	708973000	usd
CY2022Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	720923000	usd
CY2023Q4	us-gaap	Other Liabilities OtherLiabilities	821235000	usd
CY2022Q4	us-gaap	Other Liabilities OtherLiabilities	750474000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	33183686000	usd
CY2022Q4	us-gaap	Liabilities Liabilities	34590731000	usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	74372505	shares
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	74372505	shares
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	75674587	shares
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	75674587	shares
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	744000	usd
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	757000	usd
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	283642000	usd
CY2022Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	321729000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2650956000	usd
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2551400000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-357421000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-437905000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	2577921000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	2435981000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	35761607000	usd
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	37026712000	usd
CY2023	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	1318217000	usd
CY2022	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	934642000	usd
CY2021	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	800819000	usd
CY2023	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	488212000	usd
CY2022	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	280100000	usd
CY2021	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	152619000	usd
CY2023	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	51152000	usd
CY2022	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	15709000	usd
CY2021	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	6010000	usd
CY2023	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1857581000	usd
CY2022	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1230451000	usd
CY2021	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	959448000	usd
CY2023	us-gaap	Interest Expense Deposits InterestExpenseDeposits	660305000	usd
CY2022	us-gaap	Interest Expense Deposits InterestExpenseDeposits	179972000	usd
CY2021	us-gaap	Interest Expense Deposits InterestExpenseDeposits	67596000	usd
CY2023	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	323472000	usd
CY2022	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	137519000	usd
CY2021	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	96164000	usd
CY2022	us-gaap	Interest Expense InterestExpense	317491000	usd
CY2021	us-gaap	Interest Expense InterestExpense	163760000	usd
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	795688000	usd
CY2023	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	-3711000	usd
CY2022	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	-2570000	usd
CY2021	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	24394000	usd
CY2023	us-gaap	Labor And Related Expense LaborAndRelatedExpense	280744000	usd
CY2023	us-gaap	Occupancy Net OccupancyNet	43345000	usd
CY2022	us-gaap	Occupancy Net OccupancyNet	45400000	usd
CY2023	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	66747000	usd
CY2022	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	17999000	usd
CY2021	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	18695000	usd
CY2023	us-gaap	Professional Fees ProfessionalFees	14184000	usd
CY2022	us-gaap	Professional Fees ProfessionalFees	11730000	usd
CY2021	us-gaap	Professional Fees ProfessionalFees	14386000	usd
CY2023	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	79984000	usd
CY2022	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	77103000	usd
CY2021	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	67500000	usd
CY2023	bku	Swap Termination Expenses SwapTerminationExpenses	0	usd
CY2022	bku	Swap Termination Expenses SwapTerminationExpenses	0	usd
CY2021	bku	Swap Termination Expenses SwapTerminationExpenses	44833000	usd
CY2023	us-gaap	Operating Lease Expense OperatingLeaseExpense	44446000	usd
CY2022	us-gaap	Operating Lease Expense OperatingLeaseExpense	50388000	usd
CY2021	us-gaap	Operating Lease Expense OperatingLeaseExpense	53764000	usd
CY2023	us-gaap	Other Noninterest Expense OtherNoninterestExpense	106501000	usd
CY2022	us-gaap	Other Noninterest Expense OtherNoninterestExpense	72142000	usd
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	56921000	usd
CY2023	us-gaap	Noninterest Expense NoninterestExpense	635951000	usd
CY2022	us-gaap	Noninterest Expense NoninterestExpense	540310000	usd
CY2021	us-gaap	Noninterest Expense NoninterestExpense	547575000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	237084000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	375132000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	449385000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	58413000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	90161000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34401000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	178671000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	284971000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	414984000	usd
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.39
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.55
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.52
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.38
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.54
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.52
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	104508000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-498864000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-54228000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	1343000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	2906000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	6712000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	103165000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-501770000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-60940000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	25966000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	79871000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	22207000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	48647000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	66000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-38545000	usd
CY2023	bku	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuance Net Of Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceNetOfTax	0	usd
CY2022	bku	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuance Net Of Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceNetOfTax	0	usd
CY2021	bku	Other Comprehensive Income Loss Cash Flow Hedge Reclassification For Discontinuance Net Of Tax OtherComprehensiveIncomeLossCashFlowHedgeReclassificationForDiscontinuanceNetOfTax	33400000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-22681000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	79805000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	94152000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	80484000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-421965000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	33212000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	259155000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-136994000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	448196000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	178671000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	284971000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	414984000	usd
CY2023	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	-13309000	usd
CY2022	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	-7978000	usd
CY2021	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	21205000	usd
CY2023	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	87607000	usd
CY2022	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	75154000	usd
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-67119000	usd
CY2023	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	-3711000	usd
CY2022	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	-2570000	usd
CY2021	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	24394000	usd
CY2023	us-gaap	Gain Loss On Investments GainLossOnInvestments	-10052000	usd
CY2022	us-gaap	Gain Loss On Investments GainLossOnInvestments	-15805000	usd
CY2021	us-gaap	Gain Loss On Investments GainLossOnInvestments	6446000	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	19628000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	20940000	usd
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	15891000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	74060000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	77623000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	78500000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-46832000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1437000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-9015000	usd
CY2023	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	317663000	usd
CY2022	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	423893000	usd
CY2021	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	807097000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	65003000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-230382000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	148806000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	91248000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	169024000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	180688000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	657496000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1293821000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1220175000	usd
CY2023	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	405480000	usd
CY2022	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	2974352000	usd
CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	5835143000	usd
CY2023	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1036517000	usd
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1784484000	usd
CY2023	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	371777000	usd
CY2021	us-gaap	Payments To Acquire Loans Held For Investment PaymentsToAcquireLoansHeldForInvestment	4843231000	usd
CY2022	us-gaap	Proceeds From Loan And Lease Originations And Principal Collections1 ProceedsFromLoanAndLeaseOriginationsAndPrincipalCollections1	613767000	usd
CY2021	us-gaap	Proceeds From Loan And Lease Originations And Principal Collections1 ProceedsFromLoanAndLeaseOriginationsAndPrincipalCollections1	3856932000	usd
CY2023	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	38765000	usd
CY2022	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	88103000	usd
CY2021	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	305929000	usd
CY2023	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	-100328000	usd
CY2022	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	-52240000	usd
CY2021	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	31419000	usd
CY2023	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	29993000	usd
CY2022	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	41400000	usd
CY2021	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	23964000	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	980574000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2120400000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1637905000	usd
CY2023	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-970856000	usd
CY2022	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-1928768000	usd
CY2021	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1942286000	usd
CY2023	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	190000000	usd
CY2022	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	9000000	usd
CY2021	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	-19000000	usd
CY2023	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	3425000000	usd
CY2022	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	4650000000	usd
CY2021	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	946000000	usd
CY2023	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	3730000000	usd
CY2022	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	1135000000	usd
CY2021	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	2162000000	usd
CY2023	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	79091000	usd
CY2022	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	79443000	usd
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	85790000	usd
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	55154000	usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	401288000	usd
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	318499000	usd
CY2023	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-22333000	usd
CY2022	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-12132000	usd
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-6126000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1622434000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1084369000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	334871000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	15636000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	257790000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-82859000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	572647000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	314857000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	397716000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	588283000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	572647000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	314857000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	950476000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	294144000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	169291000	usd
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	48782000	usd
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-109069000	usd
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	248473000	usd
CY2023	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	361382000	usd
CY2022	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	514565000	usd
CY2021	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	1064090000	usd
CY2023	bku	Transfers Of Productive Assets To Held For Sale TransfersOfProductiveAssetsToHeldForSale	20699000	usd
CY2022	bku	Transfers Of Productive Assets To Held For Sale TransfersOfProductiveAssetsToHeldForSale	0	usd
CY2021	bku	Transfers Of Productive Assets To Held For Sale TransfersOfProductiveAssetsToHeldForSale	0	usd
CY2023	bku	Dividends Declared And Payable DividendsDeclaredAndPayable	20706000	usd
CY2022	bku	Dividends Declared And Payable DividendsDeclaredAndPayable	19346000	usd
CY2021	bku	Dividends Declared And Payable DividendsDeclaredAndPayable	19876000	usd
CY2023	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	0	usd
CY2022	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	0	usd
CY2021	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	22858000	usd
CY2023	bku	Obligation Incurred In Acquisition Of Limited Partnership ObligationIncurredInAcquisitionOfLimitedPartnership	20000000	usd
CY2022	bku	Obligation Incurred In Acquisition Of Limited Partnership ObligationIncurredInAcquisitionOfLimitedPartnership	65000000	usd
CY2021	bku	Obligation Incurred In Acquisition Of Limited Partnership ObligationIncurredInAcquisitionOfLimitedPartnership	0	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	2983012000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	448196000	usd
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.92
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	83357000	usd
CY2021	bku	Shares Issued Value Share Based Payment Arrangement After Forfeiture And Exercises SharesIssuedValueShareBasedPaymentArrangementAfterForfeitureAndExercises	8409000	usd
CY2021	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	318499000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	3037761000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-136994000	usd
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.00
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	78913000	usd
CY2022	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	15415000	usd
CY2022	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	401288000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	2435981000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	259155000	usd
CY2023	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.08
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	80451000	usd
CY2023	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	17054000	usd
CY2023	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	55154000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	2577921000	usd
CY2023Q4	bku	Number Of Operating Counties NumberOfOperatingCounties	12	rental
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-bottom:8pt;margin-top:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Accounting Estimates</span></div><div style="margin-bottom:8pt;margin-top:8pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses and disclosures of contingent assets and liabilities. Actual results could differ significantly from these estimates. </span></div>The most significant estimate impacting the Company's consolidated financial statements is the ACL.
CY2023	us-gaap	Property Plant And Equipment Impairment PropertyPlantAndEquipmentImpairment	<div style="margin-bottom:8pt;margin-top:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Premises and Equipment</span></div><div style="margin-bottom:8pt;margin-top:8pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Premises and equipment are carried at cost less accumulated depreciation and amortization and are included in other assets in the accompanying consolidated balance sheets. The Company measures assets held for sale at the lower of carrying amount or estimated fair value. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets. The lives of improvements to existing buildings are based on the lesser of the estimated remaining lives of the buildings or the estimated useful lives of the improvements. Leasehold improvements are amortized over the shorter of the expected terms of the leases at inception, considering options to extend that are reasonably assured, or their useful lives. The estimated useful lives of premises and equipment are as follows:</span></div><div style="margin-bottom:8pt;margin-top:8pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">buildings and improvements - 10 to 30 years;</span></div><div style="margin-bottom:8pt;margin-top:8pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">leasehold improvements - 3 to 20 years;</span></div><div style="margin-bottom:8pt;margin-top:8pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">aircraft and automobiles - 5 to 15 years;</span></div><div style="margin-bottom:8pt;margin-top:8pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">furniture, fixtures and equipment - 5 to 7 years; and</span></div><div style="margin-bottom:8pt;margin-top:8pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">computer equipment - 3 to 5 years.</span></div>
CY2023	us-gaap	Net Income Loss NetIncomeLoss	178671000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	284971000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	414984000	usd
CY2023	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	3565000	usd
CY2022	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	5075000	usd
CY2021	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	5991000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	175106000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	279896000	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	408993000	usd
CY2022	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	80032356	shares
CY2021	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	91612243	shares
CY2021	us-gaap	Weighted Average Number Of Shares Common Stock Subject To Repurchase Or Cancellation WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation	1212055	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	90400188	shares
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	175106000	usd
CY2023	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	275000	usd
CY2022	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	626000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	174831000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	279270000	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	408408000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	73325894	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	78807788	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	90400188	shares
CY2023	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	197441	shares
CY2022	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	94	shares
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	134	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	73523335	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	78807882	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	90400322	shares
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.38
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.54
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.52
CY2023	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1738534	shares
CY2022	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2034960	shares
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1804973	shares
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostAfterAllowanceForCreditLoss	9369428000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	5042000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	539838000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8834632000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale And Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAndHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	9379428000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale And Held To Maturity DebtSecuritiesAvailableForSaleAndHeldToMaturity	8844632000	usd
CY2023Q4	us-gaap	Investments Investments	8877354000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Amortized Cost After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostAfterAllowanceForCreditLoss	10328650000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	2854000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	677061000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9654443000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale And Held To Maturity Amortized Cost After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAndHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss	10338650000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale And Held To Maturity DebtSecuritiesAvailableForSaleAndHeldToMaturity	9664443000	usd
CY2022Q4	us-gaap	Investments Investments	9755327000	usd
CY2023Q4	bku	Number Of Held To Maturity Securities NumberOfHeldToMaturitySecurities	1	bond
CY2022Q4	bku	Number Of Held To Maturity Securities NumberOfHeldToMaturitySecurities	1	bond
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1005364000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	967514000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	5121397000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	4948460000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	1940887000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	1765738000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	1301780000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	1152920000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostAfterAllowanceForCreditLoss	9369428000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8834632000	usd
CY2023	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	1862000	usd
CY2022	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	4058000	usd
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	10005000	usd
CY2023	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	47000	usd
CY2022	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	131000	usd
CY2021	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	995000	usd
CY2023	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	1815000	usd
CY2022	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	3927000	usd
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	9010000	usd
CY2023	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-11867000	usd
CY2022	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-19732000	usd
CY2021	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-2564000	usd
CY2023	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-10052000	usd
CY2022	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-15805000	usd
CY2021	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	6446000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	364700000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	2229000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	7986044000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	537609000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	8350744000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	539838000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	4998677000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	215467000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	4334293000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	461594000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	9332970000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	677061000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	558	security
CY2023Q4	bku	Number Of Securities Amount Of Impairment Insignificant NumberOfSecuritiesAmountOfImpairmentInsignificant	114	security
CY2023Q4	bku	Availableforsalesecurities Gross Unrealized Loss Considered Insignificantfor Otti Analysis AvailableforsalesecuritiesGrossUnrealizedLossConsideredInsignificantforOTTIAnalysis	1100000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Accumulated Gross Unrealized Gain Loss Before Tax DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax	-534800000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Accumulated Gross Unrealized Gain Loss Before Tax DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax	-674200000	usd
CY2023	bku	Change In Debt Securities Available For Sale Accumulated Gross Unrealized Gain Loss Before Tax ChangeInDebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax	139400000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	24633684000	usd
CY2023Q4	bku	Percent Of Total Loans PercentOfTotalLoans	1.000
CY2022Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	24885988000	usd
CY2022Q4	bku	Percent Of Total Loans PercentOfTotalLoans	1.000
CY2023Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	202689000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	147946000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	24430995000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	24738042000	usd
CY2023Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	45000000	usd
CY2022Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	61000000	usd
CY2023Q4	bku	Pledged Financial Instruments Not Separately Reported Loans Receivable For Federal Home Loan Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivableForFederalHomeLoanBankDebt	16500000000	usd
CY2022Q4	bku	Pledged Financial Instruments Not Separately Reported Loans Receivable For Federal Home Loan Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivableForFederalHomeLoanBankDebt	12400000000	usd
CY2023Q4	us-gaap	Interest Receivable InterestReceivable	138000000	usd
CY2022Q4	us-gaap	Interest Receivable InterestReceivable	129000000	usd
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	257323000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	126457000	usd
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	257323000	usd
CY2022	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	62055000	usd
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	71250000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	12627000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	9730000	usd
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	4840000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	202689000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	147946000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	126457000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	54700000	usd
CY2022Q4	bku	Allowance For Credit Losses To Total Loans In Percent AllowanceForCreditLossesToTotalLoansInPercent	0.0059
CY2023Q4	bku	Allowance For Credit Losses To Total Loans In Percent AllowanceForCreditLossesToTotalLoansInPercent	0.0082
CY2023	bku	Accounts Receivable Allowance For Credit Loss Writeoff Year One Originated Current Fiscal Year AccountsReceivableAllowanceForCreditLossWriteoffYearOneOriginatedCurrentFiscalYear	2632000	usd
CY2023	bku	Accounts Receivable Allowance For Credit Loss Writeoff Year Two Originated Fiscal Year Before Current Fiscal Year AccountsReceivableAllowanceForCreditLossWriteoffYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear	12883000	usd
CY2023	bku	Accounts Receivable Allowance For Credit Loss Writeoff Year Three Originated Two Years Before Current Fiscal Year AccountsReceivableAllowanceForCreditLossWriteoffYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear	43000	usd
CY2023	bku	Accounts Receivable Allowance For Credit Loss Writeoff Year Four Originated Three Years Before Current Fiscal Year AccountsReceivableAllowanceForCreditLossWriteoffYearFourOriginatedThreeYearsBeforeCurrentFiscalYear	1329000	usd
CY2023	bku	Accounts Receivable Allowance For Credit Loss Writeoff Year Five Originated Four Years Before Current Fiscal Year AccountsReceivableAllowanceForCreditLossWriteoffYearFiveOriginatedFourYearsBeforeCurrentFiscalYear	9758000	usd
CY2023	bku	Accounts Receivable Allowance For Credit Loss Writeoff Originated More Than Five Years Before Current Fiscal Year AccountsReceivableAllowanceForCreditLossWriteoffOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear	7372000	usd
CY2023	bku	Accounts Receivable Allowance For Credit Loss Writeoff Originated Revolving Loans AccountsReceivableAllowanceForCreditLossWriteoffOriginatedRevolvingLoans	997000	usd
CY2023	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	35014000	usd
CY2023	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	8683000	usd
CY2022	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	1467000	usd
CY2023	us-gaap	Provision For Other Credit Losses ProvisionForOtherCreditLosses	0	usd
CY2022	us-gaap	Provision For Other Credit Losses ProvisionForOtherCreditLosses	127000	usd
CY2021	us-gaap	Provision For Other Credit Losses ProvisionForOtherCreditLosses	1428000	usd
CY2023Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	24633684000	usd
CY2022Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	24885988000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	278000000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	494000000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	126451000	usd
CY2023Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	23821000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	104426000	usd
CY2022Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	24221000	usd
CY2023	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	7700000	usd
CY2022	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	5900000	usd
CY2021	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	8000000	usd
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	71463000	usd
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	58065000	usd
CY2023	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	85064000	usd
CY2023Q4	bku	Financing Receivable Modified After12 Months FinancingReceivableModifiedAfter12Months	85064000	usd
CY2023	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	34818000	usd
CY2022	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	2624
CY2022	bku	Financing Receivable Troubled Debt Restructuring Modified In Period Amount FinancingReceivableTroubledDebtRestructuringModifiedInPeriodAmount	455836000	usd
CY2022	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	1198
CY2022	bku	Financing Receivable Troubled Debt Restructuring Modified Subsequent Default FinancingReceivableTroubledDebtRestructuringModifiedSubsequentDefault	197740000	usd
CY2021	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	240
CY2021	bku	Financing Receivable Troubled Debt Restructuring Modified In Period Amount FinancingReceivableTroubledDebtRestructuringModifiedInPeriodAmount	47910000	usd
CY2021	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	84
CY2021	bku	Financing Receivable Troubled Debt Restructuring Modified Subsequent Default FinancingReceivableTroubledDebtRestructuringModifiedSubsequentDefault	14317000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	64536000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	72211000	usd
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	21638000	usd
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	23866000	usd
CY2023Q4	bku	Total Rightof Use Asset TotalRightofUseAsset	86174000	usd
CY2022Q4	bku	Total Rightof Use Asset TotalRightofUseAsset	96077000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	72391000	usd
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	80909000	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	26501000	usd
CY2022Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	28389000	usd
CY2023Q4	bku	Total Lease Liabilities TotalLeaseLiabilities	98892000	usd
CY2022Q4	bku	Total Lease Liabilities TotalLeaseLiabilities	109298000	usd
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	18473000	usd
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	20056000	usd
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y10M24D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y7M6D
CY2023Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P10Y
CY2022Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P11Y
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.032
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.031
CY2023Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.029
CY2022Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.029
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	16761000	usd
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	18364000	usd
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	19646000	usd
CY2023	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	76000	usd
CY2022	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	134000	usd
CY2021	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	183000	usd
CY2023	us-gaap	Lease Cost LeaseCost	16837000	usd
CY2022	us-gaap	Lease Cost LeaseCost	18498000	usd
CY2021	us-gaap	Lease Cost LeaseCost	19829000	usd
CY2023	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	2228000	usd
CY2022	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	2350000	usd
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	2903000	usd
CY2023	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	778000	usd
CY2022	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	823000	usd
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	866000	usd
CY2023	bku	Totalfinanceleasecost Totalfinanceleasecost	3006000	usd
CY2022	bku	Totalfinanceleasecost Totalfinanceleasecost	3173000	usd
CY2021	bku	Totalfinanceleasecost Totalfinanceleasecost	3769000	usd
CY2023	us-gaap	Variable Lease Cost VariableLeaseCost	3440000	usd
CY2022	us-gaap	Variable Lease Cost VariableLeaseCost	3589000	usd
CY2021	us-gaap	Variable Lease Cost VariableLeaseCost	4147000	usd
CY2023	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	778000	usd
CY2022	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	823000	usd
CY2021	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	866000	usd
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	17680000	usd
CY2023	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2666000	usd
CY2022	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2652000	usd
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	3215000	usd
CY2023	bku	Totalcashpaidforamountsincludedinthemeasurementofleaseliabilities Totalcashpaidforamountsincludedinthemeasurementofleaseliabilities	21124000	usd
CY2022	bku	Totalcashpaidforamountsincludedinthemeasurementofleaseliabilities Totalcashpaidforamountsincludedinthemeasurementofleaseliabilities	21948000	usd
CY2021	bku	Totalcashpaidforamountsincludedinthemeasurementofleaseliabilities Totalcashpaidforamountsincludedinthemeasurementofleaseliabilities	24137000	usd
CY2023	bku	Operatingleaseliabilitiesrecognizedfromobtaining Ro Uassets OperatingleaseliabilitiesrecognizedfromobtainingROUassets	6896000	usd
CY2022	bku	Operatingleaseliabilitiesrecognizedfromobtaining Ro Uassets OperatingleaseliabilitiesrecognizedfromobtainingROUassets	9086000	usd
CY2021	bku	Operatingleaseliabilitiesrecognizedfromobtaining Ro Uassets OperatingleaseliabilitiesrecognizedfromobtainingROUassets	13325000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	17261000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	2701000	usd
CY2023Q4	bku	Total Lease Liability Payments Due Next Twelve Months TotalLeaseLiabilityPaymentsDueNextTwelveMonths	19962000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	14870000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	2774000	usd
CY2023Q4	bku	Total Lease Liability Payments Due Year Two TotalLeaseLiabilityPaymentsDueYearTwo	17644000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	13530000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	2849000	usd
CY2023Q4	bku	Total Lease Liability Payments Due Year Three TotalLeaseLiabilityPaymentsDueYearThree	16379000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	10809000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	2926000	usd
CY2023Q4	bku	Total Lease Liability Payments Due Year Four TotalLeaseLiabilityPaymentsDueYearFour	13735000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	8256000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	3016000	usd
CY2023Q4	bku	Total Lease Liability Payments Due Year Five TotalLeaseLiabilityPaymentsDueYearFive	11272000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	14843000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	16431000	usd
CY2023Q4	bku	Total Lease Liability Payments Due After Year Five TotalLeaseLiabilityPaymentsDueAfterYearFive	31274000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	79569000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	30697000	usd
CY2023Q4	bku	Total Lease Liability Payments Due TotalLeaseLiabilityPaymentsDue	110266000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	7178000	usd
CY2023Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	4196000	usd
CY2023Q4	bku	Total Lease Liability Undiscounted Excess Amount TotalLeaseLiabilityUndiscountedExcessAmount	11374000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	72391000	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	26501000	usd
CY2023Q4	bku	Total Lease Liabilities TotalLeaseLiabilities	98892000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	644614000	usd
CY2022Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	684847000	usd
CY2023Q4	us-gaap	Direct Financing Lease Unguaranteed Residual Asset DirectFinancingLeaseUnguaranteedResidualAsset	3938000	usd
CY2022Q4	us-gaap	Direct Financing Lease Unguaranteed Residual Asset DirectFinancingLeaseUnguaranteedResidualAsset	4024000	usd
CY2023Q4	bku	Salestypeordirectfinancingleasegrossinvestment Salestypeordirectfinancingleasegrossinvestment	648552000	usd
CY2022Q4	bku	Salestypeordirectfinancingleasegrossinvestment Salestypeordirectfinancingleasegrossinvestment	688871000	usd
CY2023Q4	us-gaap	Direct Financing Lease Deferred Selling Profit DirectFinancingLeaseDeferredSellingProfit	48403000	usd
CY2022Q4	us-gaap	Direct Financing Lease Deferred Selling Profit DirectFinancingLeaseDeferredSellingProfit	57622000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Undiscounted Excess Amount SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount	1556000	usd
CY2022Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Undiscounted Excess Amount SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount	2384000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable SalesTypeAndDirectFinancingLeasesLeaseReceivable	601705000	usd
CY2022Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable SalesTypeAndDirectFinancingLeasesLeaseReceivable	633633000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Next Twelve Months SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths	183861000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Two Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears	155587000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Three Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears	100775000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Four Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears	47973000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Five Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears	32552000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Thereafter SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter	123866000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	644614000	usd
CY2023Q4	us-gaap	Property Subject To Or Available For Operating Lease Gross PropertySubjectToOrAvailableForOperatingLeaseGross	582147000	usd
CY2022Q4	us-gaap	Property Subject To Or Available For Operating Lease Gross PropertySubjectToOrAvailableForOperatingLeaseGross	772267000	usd
CY2023Q4	us-gaap	Property Subject To Or Available For Operating Lease Accumulated Depreciation PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	210238000	usd
CY2022Q4	us-gaap	Property Subject To Or Available For Operating Lease Accumulated Depreciation PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	232468000	usd
CY2023Q4	us-gaap	Property Subject To Or Available For Operating Lease Net PropertySubjectToOrAvailableForOperatingLeaseNet	371909000	usd
CY2022Q4	us-gaap	Property Subject To Or Available For Operating Lease Net PropertySubjectToOrAvailableForOperatingLeaseNet	539799000	usd
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	2800000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	31873000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	26854000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	18764000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	15932000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	13825000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	19896000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	127144000	usd
CY2023	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	47868000	usd
CY2022	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	54111000	usd
CY2021	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	53263000	usd
CY2023	us-gaap	Direct Financing Lease Lease Income DirectFinancingLeaseLeaseIncome	15643000	usd
CY2022	us-gaap	Direct Financing Lease Lease Income DirectFinancingLeaseLeaseIncome	17881000	usd
CY2021	us-gaap	Direct Financing Lease Lease Income DirectFinancingLeaseLeaseIncome	18329000	usd
CY2023	us-gaap	Lease Income LeaseIncome	63511000	usd
CY2022	us-gaap	Lease Income LeaseIncome	71992000	usd
CY2021	us-gaap	Lease Income LeaseIncome	71592000	usd
CY2023	bku	Noninterest Bearing Deposit Liabilities Domestic Average Balance NoninterestBearingDepositLiabilitiesDomesticAverageBalance	7091029000	usd
CY2023	bku	Non Interest Bearing Average Rate In Percent NonInterestBearingAverageRateInPercent	0
CY2022	bku	Noninterest Bearing Deposit Liabilities Domestic Average Balance NoninterestBearingDepositLiabilitiesDomesticAverageBalance	8861111000	usd
CY2022	bku	Non Interest Bearing Average Rate In Percent NonInterestBearingAverageRateInPercent	0
CY2021	bku	Noninterest Bearing Deposit Liabilities Domestic Average Balance NoninterestBearingDepositLiabilitiesDomesticAverageBalance	8480964000	usd
CY2021	bku	Non Interest Bearing Average Rate In Percent NonInterestBearingAverageRateInPercent	0
CY2023	bku	Interest Bearing Deposit Liabilities Domestic Average Balance InterestBearingDepositLiabilitiesDomesticAverageBalance	2905968000	usd
CY2023	bku	Interest Bearing Average Rate In Percent InterestBearingAverageRateInPercent	0.0299
CY2022	bku	Interest Bearing Deposit Liabilities Domestic Average Balance InterestBearingDepositLiabilitiesDomesticAverageBalance	2538906000	usd
CY2022	bku	Interest Bearing Average Rate In Percent InterestBearingAverageRateInPercent	0.0055
CY2021	bku	Interest Bearing Deposit Liabilities Domestic Average Balance InterestBearingDepositLiabilitiesDomesticAverageBalance	3027649000	usd
CY2021	bku	Interest Bearing Average Rate In Percent InterestBearingAverageRateInPercent	0.0028
CY2023	bku	Savings And Money Market Average Balance SavingsAndMoneyMarketAverageBalance	10704470000	usd
CY2023	bku	Average Rate Domestic Deposit Savings And Money Market AverageRateDomesticDepositSavingsAndMoneyMarket	0.0357
CY2022	bku	Savings And Money Market Average Balance SavingsAndMoneyMarketAverageBalance	12874240000	usd
CY2022	bku	Average Rate Domestic Deposit Savings And Money Market AverageRateDomesticDepositSavingsAndMoneyMarket	0.0102
CY2021	bku	Savings And Money Market Average Balance SavingsAndMoneyMarketAverageBalance	13339651000	usd
CY2021	bku	Average Rate Domestic Deposit Savings And Money Market AverageRateDomesticDepositSavingsAndMoneyMarket	0.0032
CY2023	bku	Time Deposits Average Balance TimeDepositsAverageBalance	5169458000	usd
CY2023	bku	Average Rate Domestic Deposit Time Deposit AverageRateDomesticDepositTimeDeposit	0.0370
CY2022	bku	Time Deposits Average Balance TimeDepositsAverageBalance	3338671000	usd
CY2022	bku	Average Rate Domestic Deposit Time Deposit AverageRateDomesticDepositTimeDeposit	0.0106
CY2021	bku	Time Deposits Average Balance TimeDepositsAverageBalance	3490082000	usd
CY2021	bku	Average Rate Domestic Deposit Time Deposit AverageRateDomesticDepositTimeDeposit	0.0046
CY2023	bku	Deposits Average Balance DepositsAverageBalance	25870925000	usd
CY2023	bku	Average Rate Domestic Deposits AverageRateDomesticDeposits	0.0255
CY2022	bku	Deposits Average Balance DepositsAverageBalance	27612928000	usd
CY2022	bku	Average Rate Domestic Deposits AverageRateDomesticDeposits	0.0065
CY2021	bku	Deposits Average Balance DepositsAverageBalance	28338346000	usd
CY2021	bku	Average Rate Domestic Deposits AverageRateDomesticDeposits	0.0024
CY2023Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	941000000	usd
CY2022Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	730000000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	4693323000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	147364000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	322677000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	446000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	185000	usd
CY2023Q4	us-gaap	Time Deposits TimeDeposits	5163995000	usd
CY2023Q4	bku	Publicfundsdepositsincludedindeposits Publicfundsdepositsincludedindeposits	3100000000	usd
CY2023Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	5300000000	usd
CY2023Q4	bku	Carrying Value Of Investment Securities Available For Sale Pledged As Security For Time Deposits Issued To Subsidiary And Other Public Funds CarryingValueOfInvestmentSecuritiesAvailableForSalePledgedAsSecurityForTimeDepositsIssuedToSubsidiaryAndOtherPublicFunds	794000000	usd
CY2023Q4	bku	Fhlb Letter Of Credit Pledged As Security For Time Deposits Issued To Public Funds Deposits FHLBLetterOfCreditPledgedAsSecurityForTimeDepositsIssuedToPublicFundsDeposits	900000000	usd
CY2023	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	86759000	usd
CY2022	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	13919000	usd
CY2021	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	8550000	usd
CY2023	bku	Interest Expense Money Market And Savings Deposits InterestExpenseMoneyMarketAndSavingsDeposits	382432000	usd
CY2022	bku	Interest Expense Money Market And Savings Deposits InterestExpenseMoneyMarketAndSavingsDeposits	130705000	usd
CY2021	bku	Interest Expense Money Market And Savings Deposits InterestExpenseMoneyMarketAndSavingsDeposits	43082000	usd
CY2023	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	191114000	usd
CY2022	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	35348000	usd
CY2021	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	15964000	usd
CY2023	us-gaap	Interest Expense Domestic Deposits InterestExpenseDomesticDeposits	660305000	usd
CY2022	us-gaap	Interest Expense Domestic Deposits InterestExpenseDomesticDeposits	179972000	usd
CY2021	us-gaap	Interest Expense Domestic Deposits InterestExpenseDomesticDeposits	67596000	usd
CY2023	us-gaap	Noninterest Expense Commission Expense NoninterestExpenseCommissionExpense	44200000	usd
CY2022	us-gaap	Noninterest Expense Commission Expense NoninterestExpenseCommissionExpense	15400000	usd
CY2021	us-gaap	Noninterest Expense Commission Expense NoninterestExpenseCommissionExpense	8100000	usd
CY2023Q4	bku	Maturingin Next Twelve Months Onemonthorless MaturinginNextTwelveMonthsOnemonthorless	4220000000	usd
CY2023Q4	bku	Maturingin Next Twelve Months Onemonthorless Weighted Average Ratein Percent MaturinginNextTwelveMonthsOnemonthorlessWeightedAverageRateinPercent	0.0547
CY2023Q4	bku	Maturingin Next Twelve Months Overonemonth MaturinginNextTwelveMonthsOveronemonth	895000000	usd
CY2023Q4	bku	Maturingin Next Twelve Months Overonemonth Weighted Average Ratein Percent MaturinginNextTwelveMonthsOveronemonthWeightedAverageRateinPercent	0.0556
CY2023Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	5115000000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	14600000000	usd
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	682472000	usd
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	692534000	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	26501000	usd
CY2022Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	28389000	usd
CY2023Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	708973000	usd
CY2022Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	720923000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds	4600000000	usd
CY2023	bku	Effective Income Tax Rate Reconciliation Uncertain Tax Position Lapse Of Statute Of Limitations Percent EffectiveIncomeTaxRateReconciliationUncertainTaxPositionLapseOfStatuteOfLimitationsPercent	0.0092
CY2022	bku	Effective Income Tax Rate Reconciliation Uncertain Tax Position Lapse Of Statute Of Limitations Amount EffectiveIncomeTaxRateReconciliationUncertainTaxPositionLapseOfStatuteOfLimitationsAmount	1093000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	247751000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	236977000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	182934000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	170707000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	64817000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	66270000	usd
CY2023	us-gaap	Depreciation Nonproduction DepreciationNonproduction	18700000	usd
CY2022	us-gaap	Depreciation Nonproduction DepreciationNonproduction	17500000	usd
CY2021	us-gaap	Depreciation Nonproduction DepreciationNonproduction	16700000	usd
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	82789000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	76431000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	61814000	usd
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	22456000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	12293000	usd
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-18398000	usd
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	105245000	usd
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	88724000	usd
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	43416000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-38303000	usd
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-7191000	usd
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	4348000	usd
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-8529000	usd
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	8628000	usd
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-13363000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-46832000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1437000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-9015000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	58413000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	90161000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34401000	usd
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	49788000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.2100
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	78778000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.2100
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	94371000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.2100
CY2023	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	13404000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.0565
CY2022	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	10577000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.0282
CY2021	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	13203000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.0294
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	12162000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0513
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	17859000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0476
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	16425000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0366
CY2023	bku	Effective Income Tax Rate Reconciliation Uncertain Tax Position Lapse Of Statute Of Limitations Amount EffectiveIncomeTaxRateReconciliationUncertainTaxPositionLapseOfStatuteOfLimitationsAmount	2192000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	96225000	usd
CY2022	bku	Effective Income Tax Rate Reconciliation Uncertain Tax Position Lapse Of Statute Of Limitations Percent EffectiveIncomeTaxRateReconciliationUncertainTaxPositionLapseOfStatuteOfLimitationsPercent	0.0029
CY2021	bku	Effective Income Tax Rate Reconciliation Uncertain Tax Position Lapse Of Statute Of Limitations Amount EffectiveIncomeTaxRateReconciliationUncertainTaxPositionLapseOfStatuteOfLimitationsAmount	25633000	usd
CY2021	bku	Effective Income Tax Rate Reconciliation Uncertain Tax Position Lapse Of Statute Of Limitations Percent EffectiveIncomeTaxRateReconciliationUncertainTaxPositionLapseOfStatuteOfLimitationsPercent	0.0570
CY2023	bku	Effective Income Tax Rate Reconciliation Uncertain Tax Position Interest Amount EffectiveIncomeTaxRateReconciliationUncertainTaxPositionInterestAmount	-10605000	usd
CY2023	bku	Effective Income Tax Rate Reconciliation Uncertain Tax Position Interest Percent EffectiveIncomeTaxRateReconciliationUncertainTaxPositionInterestPercent	-0.0447
CY2022	bku	Effective Income Tax Rate Reconciliation Uncertain Tax Position Interest Amount EffectiveIncomeTaxRateReconciliationUncertainTaxPositionInterestAmount	-6348000	usd
CY2022	bku	Effective Income Tax Rate Reconciliation Uncertain Tax Position Interest Percent EffectiveIncomeTaxRateReconciliationUncertainTaxPositionInterestPercent	-0.0169
CY2021	bku	Effective Income Tax Rate Reconciliation Uncertain Tax Position Interest Amount EffectiveIncomeTaxRateReconciliationUncertainTaxPositionInterestAmount	-7397000	usd
CY2021	bku	Effective Income Tax Rate Reconciliation Uncertain Tax Position Interest Percent EffectiveIncomeTaxRateReconciliationUncertainTaxPositionInterestPercent	-0.0165
CY2023	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	0	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	0
CY2022	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	0	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	0
CY2021	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-43950000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	-0.0978
CY2023	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1454000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.0061
CY2022	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1154000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.0031
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1006000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.0023
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	58413000	usd
CY2023	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2464
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	90161000	usd
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2403
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34401000	usd
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.0766
CY2021	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	43900000	usd
CY2023Q4	bku	Deferred Tax Assets Excess Of Tax Basis Over Carrying Value Of Acquired Loans DeferredTaxAssetsExcessOfTaxBasisOverCarryingValueOfAcquiredLoans	5246000	usd
CY2022Q4	bku	Deferred Tax Assets Excess Of Tax Basis Over Carrying Value Of Acquired Loans DeferredTaxAssetsExcessOfTaxBasisOverCarryingValueOfAcquiredLoans	6243000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	55188000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	38211000	usd
CY2023Q4	bku	Deferred Tax Asset Net Unrealized Losson Securities Availablefor Sale DeferredTaxAssetNetUnrealizedLossonSecuritiesAvailableforSale	125580000	usd
CY2022Q4	bku	Deferred Tax Asset Net Unrealized Losson Securities Availablefor Sale DeferredTaxAssetNetUnrealizedLossonSecuritiesAvailableforSale	153858000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	10805000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	18380000	usd
CY2023Q4	bku	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	18592000	usd
CY2022Q4	bku	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	20655000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	11431000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	9873000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	19301000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	131018000	usd
CY2023Q4	bku	Deferred Tax Liabilities Right Of Use Asset DeferredTaxLiabilitiesRightOfUseAsset	31886000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	11464000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	29746000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	34796000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	275889000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	293480000	usd
CY2022Q4	bku	Deferred Tax Liabilities Right Of Use Asset DeferredTaxLiabilitiesRightOfUseAsset	31253000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	5480000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	7005000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	133591000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	169276000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	142298000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	124204000	usd
CY2023Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	17700000	usd
CY2023Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	111000000	usd
CY2022Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	100000000	usd
CY2023Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	77000000	usd
CY2022Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	62000000	usd
CY2023Q4	us-gaap	Variable Interest Entity Entity Maximum Loss Exposure Amount VariableInterestEntityEntityMaximumLossExposureAmount	164000000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	369880000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	347809000	usd
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	414203000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2802000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3086000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2175000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	708000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	12433000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	12887000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	347000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	usd
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	43782000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1617000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	795000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	30394000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	371426000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	362533000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	355089000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	12469000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	7347000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	7280000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	383895000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	369880000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	347809000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	343800000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	342600000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	329300000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	26400000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	16500000	usd
CY2023	bku	Unrecognized Tax Benefits Income Tax Penaltiesand Interest Expensenetoftax UnrecognizedTaxBenefitsIncomeTaxPenaltiesandInterestExpensenetoftax	10000000	usd
CY2022	bku	Unrecognized Tax Benefits Income Tax Penaltiesand Interest Expensenetoftax UnrecognizedTaxBenefitsIncomeTaxPenaltiesandInterestExpensenetoftax	5900000	usd
CY2021	bku	Unrecognized Tax Benefits Income Tax Penaltiesand Interest Expensenetoftax UnrecognizedTaxBenefitsIncomeTaxPenaltiesandInterestExpensenetoftax	-5700000	usd
CY2023	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	65739000	usd
CY2022	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	90000	usd
CY2021	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-51739000	usd
CY2021Q4	bku	Notional Amount Of Discontinued Cash Flow Hedge NotionalAmountOfDiscontinuedCashFlowHedge	401000000	usd
CY2023Q4	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	-38400000	usd
CY2023Q4	us-gaap	Hedged Asset Fair Value Hedge HedgedAssetFairValueHedge	100000000	usd
CY2022Q4	us-gaap	Hedged Asset Fair Value Hedge HedgedAssetFairValueHedge	100000000	usd
CY2023Q4	us-gaap	Hedged Asset Fair Value Hedge Cumulative Increase Decrease HedgedAssetFairValueHedgeCumulativeIncreaseDecrease	-1656000	usd
CY2022Q4	us-gaap	Hedged Asset Fair Value Hedge Cumulative Increase Decrease HedgedAssetFairValueHedgeCumulativeIncreaseDecrease	-3923000	usd
CY2023Q4	us-gaap	Closed Portfolio And Beneficial Interest Last Of Layer Amortized Cost ClosedPortfolioAndBeneficialInterestLastOfLayerAmortizedCost	992000000	usd
CY2022Q4	us-gaap	Closed Portfolio And Beneficial Interest Last Of Layer Amortized Cost ClosedPortfolioAndBeneficialInterestLastOfLayerAmortizedCost	1000000000	usd
CY2023	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	8700000	usd
CY2022	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	4700000	usd
CY2021	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	6600000	usd
CY2023Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	88956000	usd
CY2023Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	0	usd
CY2023Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	88956000	usd
CY2023Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	15154000	usd
CY2023Q4	us-gaap	Derivative Asset Fair Value Of Collateral DerivativeAssetFairValueOfCollateral	73730000	usd
CY2023Q4	bku	Derivative Asset Net Amount Not Offset DerivativeAssetNetAmountNotOffset	72000	usd
CY2023Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	17750000	usd
CY2023Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	0	usd
CY2023Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	17750000	usd
CY2023Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	15154000	usd
CY2023Q4	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	2596000	usd
CY2023Q4	bku	Derivative Liability Net Amount Not Offset DerivativeLiabilityNetAmountNotOffset	0	usd
CY2023Q4	bku	Gross Amounts Recognized Derivative Assets And Liabilities GrossAmountsRecognizedDerivativeAssetsAndLiabilities	71206000	usd
CY2023Q4	bku	Derivative Asset Liability Collateral Offset DerivativeAssetLiabilityCollateralOffset	0	usd
CY2023Q4	bku	Derivative Asset Liability Fair Value Amount Not Offset Against Collateral DerivativeAssetLiabilityFairValueAmountNotOffsetAgainstCollateral	71206000	usd
CY2023Q4	bku	Derivative Asset Liability Fair Value Gross Liability Asset DerivativeAssetLiabilityFairValueGrossLiabilityAsset	0	usd
CY2023Q4	bku	Derivative Asset Liability Fair Value Of Collateral DerivativeAssetLiabilityFairValueOfCollateral	71134000	usd
CY2023Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	72000	usd
CY2022Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	86544000	usd
CY2022Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	0	usd
CY2022Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	86544000	usd
CY2022Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	3912000	usd
CY2022Q4	us-gaap	Derivative Asset Fair Value Of Collateral DerivativeAssetFairValueOfCollateral	79447000	usd
CY2022Q4	bku	Derivative Asset Net Amount Not Offset DerivativeAssetNetAmountNotOffset	3185000	usd
CY2022Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	3912000	usd
CY2022Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	0	usd
CY2022Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	3912000	usd
CY2022Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	3912000	usd
CY2022Q4	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	0	usd
CY2022Q4	bku	Derivative Liability Net Amount Not Offset DerivativeLiabilityNetAmountNotOffset	0	usd
CY2022Q4	bku	Gross Amounts Recognized Derivative Assets And Liabilities GrossAmountsRecognizedDerivativeAssetsAndLiabilities	82632000	usd
CY2022Q4	bku	Derivative Asset Liability Collateral Offset DerivativeAssetLiabilityCollateralOffset	0	usd
CY2022Q4	bku	Derivative Asset Liability Fair Value Amount Not Offset Against Collateral DerivativeAssetLiabilityFairValueAmountNotOffsetAgainstCollateral	82632000	usd
CY2022Q4	bku	Derivative Asset Liability Fair Value Gross Liability Asset DerivativeAssetLiabilityFairValueGrossLiabilityAsset	0	usd
CY2022Q4	bku	Derivative Asset Liability Fair Value Of Collateral DerivativeAssetLiabilityFairValueOfCollateral	79447000	usd
CY2022Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	3185000	usd
CY2023Q4	bku	Risk Participation Agreement Derivative Notional Amount RiskParticipationAgreementDerivativeNotionalAmount	363000000	usd
CY2022Q4	bku	Risk Participation Agreement Derivative Notional Amount RiskParticipationAgreementDerivativeNotionalAmount	202000000	usd
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	141227000	usd
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	36719000	usd
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	104508000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	1815000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	472000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	1343000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	139412000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	36247000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	103165000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	35089000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	9123000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	25966000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax	-30650000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-7969000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-22681000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	108762000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	28278000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	80484000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-674115000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-175251000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-498864000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	3927000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1021000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	2906000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-678042000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-176272000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-501770000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	107764000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	27893000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	79871000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax	107674000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	27869000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	79805000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-570368000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-148403000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-421965000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-72789000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-18561000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-54228000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	9010000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	2298000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	6712000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-81799000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-20859000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-60940000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	29808000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	7601000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	22207000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax	126380000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	32228000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	94152000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	44581000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	11369000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	33212000	usd
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Additional Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized	1900000	shares
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	3766764	shares
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2472999	shares
CY2023	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	24554000	usd
CY2022	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	25328000	usd
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	23983000	usd
CY2023	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	6384000	usd
CY2022	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	6585000	usd
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	6116000	usd
CY2023	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	18170000	usd
CY2022	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	18743000	usd
CY2021	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	17867000	usd
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P4Y
CY2023	bku	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Date Of Grant Closing Price Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodDateOfGrantClosingPriceMinimum	16.94
CY2023	bku	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Date Of Grant Closing Price Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodDateOfGrantClosingPriceMaximum	35.39
CY2022	bku	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Date Of Grant Closing Price Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodDateOfGrantClosingPriceMinimum	39.39
CY2022	bku	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Date Of Grant Closing Price Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodDateOfGrantClosingPriceMaximum	43.67
CY2021	bku	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Date Of Grant Closing Price Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodDateOfGrantClosingPriceMinimum	42.01
CY2021	bku	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Date Of Grant Closing Price Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodDateOfGrantClosingPriceMaximum	47.52
CY2023	bku	Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Grant Date Fair Value Vested SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateGrantDateFairValueVested	20757000	usd
CY2022	bku	Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Grant Date Fair Value Vested SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateGrantDateFairValueVested	14383000	usd
CY2021	bku	Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Grant Date Fair Value Vested SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateGrantDateFairValueVested	16319000	usd
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1569	shares
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	15.94
CY2023Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	8973012000	usd
CY2023Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	96929000	usd
CY2022Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	9834066000	usd
CY2022Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	126220000	usd
CY2023Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	8877281000	usd
CY2022Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	9755190000	usd
CY2023Q4	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	5088819000	usd
CY2023	us-gaap	Cash Dividends Paid To Parent Company By Consolidated Subsidiaries CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries	85000000	usd
CY2022	us-gaap	Cash Dividends Paid To Parent Company By Consolidated Subsidiaries CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries	605000000	usd
CY2021	us-gaap	Cash Dividends Paid To Parent Company By Consolidated Subsidiaries CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries	312000000	usd
CY2023Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	483205000	usd
CY2023Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	470539000	usd
CY2023Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	463421000	usd
CY2023Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	440416000	usd
CY2023	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1857581000	usd
CY2023Q4	us-gaap	Interest Expense InterestExpense	265995000	usd
CY2023Q3	us-gaap	Interest Expense InterestExpense	255697000	usd
CY2023Q2	us-gaap	Interest Expense InterestExpense	249543000	usd
CY2023Q1	us-gaap	Interest Expense InterestExpense	212542000	usd
CY2023	us-gaap	Interest Expense InterestExpense	983777000	usd
CY2023Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	217210000	usd
CY2023Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	214842000	usd
CY2023Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	213878000	usd
CY2023Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	227874000	usd
CY2023	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	873804000	usd
CY2023Q4	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	19253000	usd
CY2023Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	33049000	usd
CY2023Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	15517000	usd
CY2023Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	19788000	usd
CY2023	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	87607000	usd
CY2023Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	197957000	usd
CY2023Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	181793000	usd
CY2023Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	198361000	usd
CY2023Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	208086000	usd
CY2023	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	786197000	usd
CY2023Q4	us-gaap	Noninterest Income NoninterestIncome	17092000	usd
CY2023Q3	us-gaap	Noninterest Income NoninterestIncome	27724000	usd
CY2023Q2	us-gaap	Noninterest Income NoninterestIncome	25487000	usd
CY2023Q1	us-gaap	Noninterest Income NoninterestIncome	16535000	usd
CY2023	us-gaap	Noninterest Income NoninterestIncome	86838000	usd
CY2023Q4	us-gaap	Noninterest Expense NoninterestExpense	190863000	usd
CY2023Q3	us-gaap	Noninterest Expense NoninterestExpense	147090000	usd
CY2023Q2	us-gaap	Noninterest Expense NoninterestExpense	145218000	usd
CY2023Q1	us-gaap	Noninterest Expense NoninterestExpense	152780000	usd
CY2023	us-gaap	Noninterest Expense NoninterestExpense	635951000	usd
CY2023Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	24186000	usd
CY2023Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	62427000	usd
CY2023Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	78630000	usd
CY2023Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	71841000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	237084000	usd
CY2023Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3374000	usd
CY2023Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15446000	usd
CY2023Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20634000	usd
CY2023Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18959000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	58413000	usd
CY2023Q4	us-gaap	Net Income Loss NetIncomeLoss	20812000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	46981000	usd
CY2023Q2	us-gaap	Net Income Loss NetIncomeLoss	57996000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	52882000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	178671000	usd
CY2023Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.27
CY2023Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.63
CY2023Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.78
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.71
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.39
CY2023Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.27
CY2023Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.63
CY2023Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.78
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.70
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.38
CY2022Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	401490000	usd
CY2022Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	326024000	usd
CY2022Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	266973000	usd
CY2022Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	235964000	usd
CY2022	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1230451000	usd
CY2022Q4	us-gaap	Interest Expense InterestExpense	158424000	usd
CY2022Q3	us-gaap	Interest Expense InterestExpense	90188000	usd
CY2022Q2	us-gaap	Interest Expense InterestExpense	41557000	usd
CY2022Q1	us-gaap	Interest Expense InterestExpense	27322000	usd
CY2022	us-gaap	Interest Expense InterestExpense	317491000	usd
CY2022Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	243066000	usd
CY2022Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	235836000	usd
CY2022Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	225416000	usd
CY2022Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	208642000	usd
CY2022	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	912960000	usd
CY2022Q4	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	39608000	usd
CY2022Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	3720000	usd
CY2022Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	23996000	usd
CY2022Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	7830000	usd
CY2022	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	75154000	usd
CY2022Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	203458000	usd
CY2022Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	232116000	usd
CY2022Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	201420000	usd
CY2022Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	200812000	usd
CY2022	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	837806000	usd
CY2022Q4	us-gaap	Noninterest Income NoninterestIncome	26813000	usd
CY2022Q3	us-gaap	Noninterest Income NoninterestIncome	23072000	usd
CY2022Q2	us-gaap	Noninterest Income NoninterestIncome	13450000	usd
CY2022Q1	us-gaap	Noninterest Income NoninterestIncome	14301000	usd
CY2022	us-gaap	Noninterest Income NoninterestIncome	77636000	usd
CY2022Q4	us-gaap	Noninterest Expense NoninterestExpense	148479000	usd
CY2022Q3	us-gaap	Noninterest Expense NoninterestExpense	138105000	usd
CY2022Q2	us-gaap	Noninterest Expense NoninterestExpense	127402000	usd
CY2022Q1	us-gaap	Noninterest Expense NoninterestExpense	126324000	usd
CY2022	us-gaap	Noninterest Expense NoninterestExpense	540310000	usd
CY2022Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	81792000	usd
CY2022Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	117083000	usd
CY2022Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	87468000	usd
CY2022Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	88789000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	375132000	usd
CY2022Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17585000	usd
CY2022Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29233000	usd
CY2022Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21704000	usd
CY2022Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21639000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	90161000	usd
CY2022Q4	us-gaap	Net Income Loss NetIncomeLoss	64207000	usd
CY2022Q3	us-gaap	Net Income Loss NetIncomeLoss	87850000	usd
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	65764000	usd
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	67150000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	284971000	usd
CY2022Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.83
CY2022Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.13
CY2022Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.82
CY2022Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.79
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.55
CY2022Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.82
CY2022Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.12
CY2022Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.82
CY2022Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.79
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.54
CY2023Q4	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	35400000	usd
CY2023	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2023	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2023	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false

Files In Submission

Name	View Source	Status
0001504008-24-000006-index-headers.html	Edgar Link	pending
0001504008-24-000006-index.html	Edgar Link	pending
0001504008-24-000006.txt	Edgar Link	pending
0001504008-24-000006-xbrl.zip	Edgar Link	pending
a20231231ex211.htm	Edgar Link	pending
a20231231ex231.htm	Edgar Link	pending
a20231231ex311.htm	Edgar Link	pending
a20231231ex312.htm	Edgar Link	pending
a20231231ex321.htm	Edgar Link	pending
a20231231ex322.htm	Edgar Link	pending
a20231231ex48.htm	Edgar Link	pending
bku-20231231.htm	Edgar Link	pending
bku-20231231.xsd	Edgar Link	pending
bku-20231231_g1.jpg	Edgar Link	pending
bku-20231231_g10.jpg	Edgar Link	pending
bku-20231231_g11.jpg	Edgar Link	pending
bku-20231231_g12.jpg	Edgar Link	pending
bku-20231231_g13.jpg	Edgar Link	pending
bku-20231231_g14.jpg	Edgar Link	pending
bku-20231231_g15.jpg	Edgar Link	pending
bku-20231231_g16.jpg	Edgar Link	pending
bku-20231231_g17.jpg	Edgar Link	pending
bku-20231231_g18.jpg	Edgar Link	pending
bku-20231231_g19.jpg	Edgar Link	pending
bku-20231231_g2.jpg	Edgar Link	pending
bku-20231231_g20.jpg	Edgar Link	pending
bku-20231231_g21.jpg	Edgar Link	pending
bku-20231231_g22.jpg	Edgar Link	pending
bku-20231231_g23.jpg	Edgar Link	pending
bku-20231231_g24.jpg	Edgar Link	pending
bku-20231231_g25.jpg	Edgar Link	pending
bku-20231231_g26.jpg	Edgar Link	pending
bku-20231231_g27.jpg	Edgar Link	pending
bku-20231231_g28.jpg	Edgar Link	pending
bku-20231231_g29.jpg	Edgar Link	pending
bku-20231231_g3.jpg	Edgar Link	pending
bku-20231231_g30.jpg	Edgar Link	pending
bku-20231231_g31.jpg	Edgar Link	pending
bku-20231231_g32.jpg	Edgar Link	pending
bku-20231231_g33.jpg	Edgar Link	pending
bku-20231231_def.xml	Edgar Link	unprocessable
bku-20231231_g34.jpg	Edgar Link	pending
bku-20231231_g35.jpg	Edgar Link	pending
bku-20231231_g36.jpg	Edgar Link	pending
bku-20231231_g37.jpg	Edgar Link	pending
bku-20231231_g38.jpg	Edgar Link	pending
bku-20231231_g39.jpg	Edgar Link	pending
bku-20231231_g4.jpg	Edgar Link	pending
bku-20231231_g40.jpg	Edgar Link	pending
bku-20231231_g41.jpg	Edgar Link	pending
bku-20231231_g5.jpg	Edgar Link	pending
bku-20231231_g6.jpg	Edgar Link	pending
bku-20231231_g7.jpg	Edgar Link	pending
bku-20231231_g8.jpg	Edgar Link	pending
bku-20231231_g9.jpg	Edgar Link	pending
exhibit1014-bankunitedincp.htm	Edgar Link	pending
exhibit1015-bankunitedincp.htm	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R102.htm	Edgar Link	pending
R103.htm	Edgar Link	pending
R104.htm	Edgar Link	pending
R105.htm	Edgar Link	pending
R106.htm	Edgar Link	pending
R107.htm	Edgar Link	pending
R108.htm	Edgar Link	pending
R109.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R110.htm	Edgar Link	pending
R111.htm	Edgar Link	pending
R112.htm	Edgar Link	pending
R113.htm	Edgar Link	pending
R114.htm	Edgar Link	pending
R115.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
bku-20231231_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
bku-20231231_htm.xml	Edgar Link	completed
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
R99.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending
bku-20231231_cal.xml	Edgar Link	unprocessable
bku-20231231_lab.xml	Edgar Link	unprocessable

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$BKU
BankUnited, Inc. Stock $bku

2024 Q1 Form 10-K Financial Statement

#000150400824000006 Filed on February 20, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BKU BankUnited, Inc. Stock $bku

2024 Q1 Form 10-K Financial Statement

#000150400824000006 Filed on February 20, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BKU
BankUnited, Inc. Stock $bku