$BKU
BankUnited, Inc. Stock $bku

$bku Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-Q Financial Statement

#000150400819000037 Filed on November 08, 2019

Income Statement

Concept	2019 Q4	2019 Q3	2018 Q3
Revenue	$309.4M	$323.4M	$357.7M
YoY Change	-25.41%	-9.59%	15.6%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development		$10.99M	$9.262M
YoY Change		18.7%	168.31%
% of Gross Profit
Depreciation & Amortization	$19.30M	$17.50M	$20.10M
YoY Change	50.78%	-12.94%	30.52%
% of Gross Profit
Operating Expenses		$10.99M	$9.262M
YoY Change		18.7%	168.31%
Operating Profit
YoY Change
Interest Expense	$124.1M	$137.7M	$105.7M
YoY Change	3.64%	30.23%	55.1%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$104.5M	$100.4M	$118.7M
YoY Change	51.23%	-15.42%	18.67%
Income Tax	$15.07M	$24.18M	$21.38M
% Of Pretax Income	14.42%	24.09%	18.01%
Net Earnings	$89.46M	$76.22M	$97.33M
YoY Change	70.71%	-21.69%	43.6%
Net Earnings / Revenue	28.91%	23.57%	27.21%
Basic Earnings Per Share	$0.91	$0.78	$0.90
Diluted Earnings Per Share	$0.91	$0.77	$0.90
COMMON SHARES
Basic Shares Outstanding	94.95M shares	93.98M shares	103.9M shares
Diluted Shares Outstanding		94.26M shares	104.4M shares

Balance Sheet

Concept	2019 Q4	2019 Q3	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$214.7M	$230.2M	$279.8M
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	$58.10M	$697.0M	$662.0M
YoY Change	-11.74%	5.29%	12.59%
Goodwill	$78.00M
YoY Change	0.0%
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	$32.87B	$32.95B	$31.51B
YoY Change	2.2%	4.56%	6.63%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$100.0M	$175.0M	$175.0M
YoY Change	-42.86%	0.0%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$100.0M	$175.0M	$175.0M
YoY Change	-42.86%	0.0%
LONG-TERM LIABILITIES
Long-Term Debt	$429.0M	$404.0M	$403.0M
YoY Change	6.45%	0.25%	0.0%
Other Long-Term Liabilities	$486.0M	$575.0M	$610.0M
YoY Change	23.66%	-5.74%	40.55%
Total Long-Term Liabilities	$915.0M	$979.0M	$1.013B
YoY Change	14.95%	-3.36%	21.03%
TOTAL LIABILITIES
Total Short-Term Liabilities	$100.0M	$175.0M	$175.0M
Total Long-Term Liabilities	$915.0M	$979.0M	$1.013B
Total Liabilities	$29.89B	$30.04B	$28.44B
YoY Change	2.22%	5.63%	5.6%
SHAREHOLDERS EQUITY
Retained Earnings	$1.928B	$1.859B	$1.667B
YoY Change	13.54%	11.51%	54.78%
Common Stock	$951.0K	$951.0K	$1.037M
YoY Change	-4.04%	-8.29%	-2.9%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.981B	$2.909B	$3.075B
YoY Change
Total Liabilities & Shareholders Equity	$32.87B	$32.95B	$31.51B
YoY Change	2.2%	4.56%	6.63%

Cashflow Statement

Concept	2019 Q4	2019 Q3	2018 Q3
OPERATING ACTIVITIES
Net Income	$89.46M	$76.22M	$97.33M
YoY Change	70.71%	-21.69%	43.6%
Depreciation, Depletion And Amortization	$19.30M	$17.50M	$20.10M
YoY Change	50.78%	-12.94%	30.52%
Cash From Operating Activities	$223.5M	$174.4M	$174.0M
YoY Change	-46.84%	0.23%	70.09%
INVESTING ACTIVITIES
Capital Expenditures	-$25.50M	-$1.200M	-$81.20M
YoY Change	-52.07%	-98.52%	226.1%
Acquisitions
YoY Change
Other Investing Activities	-$57.50M	-$92.60M	-$282.0M
YoY Change	-94.53%	-67.16%	-26.75%
Cash From Investing Activities	-$83.00M	-$93.70M	-$363.2M
YoY Change	-92.48%	-74.2%	-11.39%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-156.1M	-293.2M	89.70M
YoY Change	-119.85%	-426.87%	-75.89%
NET CHANGE
Cash From Operating Activities	223.5M	174.4M	174.0M
Cash From Investing Activities	-83.00M	-93.70M	-363.2M
Cash From Financing Activities	-156.1M	-293.2M	89.70M
Net Change In Cash	-15.60M	-212.5M	-99.50M
YoY Change	-115.23%	113.57%	-254.5%
FREE CASH FLOW
Cash From Operating Activities	$223.5M	$174.4M	$174.0M
Capital Expenditures	-$25.50M	-$1.200M	-$81.20M
Free Cash Flow	$249.0M	$175.6M	$255.2M
YoY Change	-47.42%	-31.19%	100.63%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2018Q4	bku	Loans And Leases Receivable Net Of Deferred Income Covered LoansAndLeasesReceivableNetOfDeferredIncomeCovered	201376000	USD
CY2018Q4	bku	Number Of Held To Maturity Securities NumberOfHeldToMaturitySecurities	1	security
CY2019Q3	bku	Number Of Held To Maturity Securities NumberOfHeldToMaturitySecurities	1	security
	bku	Number Of Securities Determined To Be Other Than Temporarily Impaired During The Period NumberOfSecuritiesDeterminedToBeOtherThanTemporarilyImpairedDuringThePeriod	0	security
	bku	Number Of Securities Determined To Be Other Than Temporarily Impaired During The Period NumberOfSecuritiesDeterminedToBeOtherThanTemporarilyImpairedDuringThePeriod	0	security
	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	42.80
	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	36.65
	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	39.04
	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	31.07
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
	dei	Entity Central Index Key EntityCentralIndexKey	0001504008
CY2018Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.21
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.63
CY2019Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.21
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.63
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding		shares
	dei	Document Period End Date DocumentPeriodEndDate	2019-09-30
CY2019Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2019Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	99141374	shares
CY2019Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued		shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	99141374	shares
CY2018Q3	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	200000	USD
	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	200000	USD
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	City Area Code CityAreaCode	305
	dei	Local Phone Number LocalPhoneNumber	569-2000
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-35039
	dei	Entity Registrant Name EntityRegistrantName	BankUnited, Inc.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-0162450
	dei	Entity Address Address Line1 EntityAddressAddressLine1	14817 Oak Lane
	dei	Entity Address City Or Town EntityAddressCityOrTown	Miami Lakes
	dei	Entity Address State Or Province EntityAddressStateOrProvince	FL
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	33016
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2019Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	94945379	shares
CY2019Q3	us-gaap	Cash And Due From Banks CashAndDueFromBanks	15401000	USD
CY2018Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	9392000	USD
CY2019Q3	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	214827000	USD
CY2018Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	372681000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	230228000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	382073000	USD
CY2019Q3	us-gaap	Investments Investments	7970656000	USD
CY2018Q4	us-gaap	Investments Investments	8166878000	USD
CY2019Q3	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	272789000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	267052000	USD
CY2019Q3	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	46332000	USD
CY2018Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	36992000	USD
CY2019Q3	bku	Loans And Leases Receivable Net Of Deferred Income Covered And Not Covered LoansAndLeasesReceivableNetOfDeferredIncomeCoveredAndNotCovered	22855500000	USD
CY2018Q4	bku	Loans And Leases Receivable Net Of Deferred Income Covered And Not Covered LoansAndLeasesReceivableNetOfDeferredIncomeCoveredAndNotCovered	21977008000	USD
CY2019Q3	bku	Loans And Leases Receivable Allowance Covered And Not Covered LoansAndLeasesReceivableAllowanceCoveredAndNotCovered	108462000	USD
CY2018Q4	bku	Loans And Leases Receivable Allowance Covered And Not Covered LoansAndLeasesReceivableAllowanceCoveredAndNotCovered	109931000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Net Reported Amount Covered And Not Covered LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered	22747038000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Reported Amount Covered And Not Covered LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered	21867077000	USD
CY2019Q3	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	280839000	USD
CY2018Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	263340000	USD
CY2019Q3	us-gaap	Property Subject To Or Available For Operating Lease Net PropertySubjectToOrAvailableForOperatingLeaseNet	696899000	USD
CY2018Q4	us-gaap	Property Subject To Or Available For Operating Lease Net PropertySubjectToOrAvailableForOperatingLeaseNet	702354000	USD
CY2019Q3	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	77685000	USD
CY2018Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	77718000	USD
CY2019Q3	us-gaap	Other Assets OtherAssets	628069000	USD
CY2018Q4	us-gaap	Other Assets OtherAssets	400842000	USD
CY2018Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	11261746000	USD
CY2019Q3	us-gaap	Time Deposits TimeDeposits	7046560000	USD
CY2018Q4	us-gaap	Time Deposits TimeDeposits	6819758000	USD
CY2019Q3	us-gaap	Assets Assets	32950535000	USD
CY2018Q4	us-gaap	Assets Assets	32164326000	USD
CY2019Q3	us-gaap	Noninterest Bearing Domestic Deposit Demand NoninterestBearingDomesticDepositDemand	4126788000	USD
CY2018Q4	us-gaap	Noninterest Bearing Domestic Deposit Demand NoninterestBearingDomesticDepositDemand	3621254000	USD
CY2019Q3	us-gaap	Interest Bearing Domestic Deposit Demand InterestBearingDomesticDepositDemand	1847301000	USD
CY2018Q4	us-gaap	Interest Bearing Domestic Deposit Demand InterestBearingDomesticDepositDemand	1771465000	USD
CY2019Q3	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	10935779000	USD
CY2019Q3	us-gaap	Deposits Deposits	23956428000	USD
CY2018Q4	us-gaap	Deposits Deposits	23474223000	USD
CY2019Q3	us-gaap	Federal Funds Purchased FederalFundsPurchased	175000000	USD
CY2018Q4	us-gaap	Federal Funds Purchased FederalFundsPurchased	175000000	USD
CY2019Q3	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	4930638000	USD
CY2018Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	4796000000	USD
CY2019Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	403832000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	402749000	USD
CY2019Q3	us-gaap	Other Liabilities OtherLiabilities	575362000	USD
CY2018Q4	us-gaap	Other Liabilities OtherLiabilities	392521000	USD
CY2019Q3	us-gaap	Liabilities Liabilities	30041260000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	29240493000	USD
CY2019Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q3	us-gaap	Common Stock Value CommonStockValue	951000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	991000	USD
CY2019Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1077946000	USD
CY2018Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1220147000	USD
CY2019Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1859055000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1697822000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-28677000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	4873000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	2909275000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	2923833000	USD
CY2019Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	32950535000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	32164326000	USD
CY2019Q3	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	248770000	USD
CY2018Q3	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	293543000	USD
	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	738766000	USD
	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	855807000	USD
CY2019Q3	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	69413000	USD
CY2018Q3	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	59319000	USD
	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	218554000	USD
	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	165396000	USD
CY2019Q3	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	5219000	USD
CY2018Q3	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	4855000	USD
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	196916000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	1034348000	USD
CY2019Q3	us-gaap	Interest Expense Deposits InterestExpenseDeposits	99483000	USD
CY2018Q3	us-gaap	Interest Expense Deposits InterestExpenseDeposits	75257000	USD
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	296891000	USD
	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	15140000	USD
	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	13145000	USD
CY2019Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	323402000	USD
CY2018Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	357717000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	972460000	USD
CY2019Q3	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	38229000	USD
CY2018Q3	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	30492000	USD
	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	108095000	USD
	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	82392000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	137712000	USD
CY2018Q3	us-gaap	Interest Expense InterestExpense	105749000	USD
	us-gaap	Interest Expense InterestExpense	404986000	USD
	us-gaap	Interest Expense InterestExpense	279308000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	185690000	USD
CY2018Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	251968000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	567474000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	755040000	USD
CY2019Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1839000	USD
CY2018Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1200000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	9373000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	13342000	USD
CY2019Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	183851000	USD
CY2018Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	250768000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	558101000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	741698000	USD
CY2019Q3	bku	Income Loss From Resolution Of Covered Assets IncomeLossFromResolutionOfCoveredAssets	0	USD
CY2018Q3	bku	Income Loss From Resolution Of Covered Assets IncomeLossFromResolutionOfCoveredAssets	3134000	USD
	bku	Income Loss From Resolution Of Covered Assets IncomeLossFromResolutionOfCoveredAssets	0	USD
	bku	Income Loss From Resolution Of Covered Assets IncomeLossFromResolutionOfCoveredAssets	10689000	USD
CY2019Q3	bku	Gain Loss On Indemnification Asset GainLossOnIndemnificationAsset	0	USD
CY2018Q3	bku	Gain Loss On Indemnification Asset GainLossOnIndemnificationAsset	3090000	USD
	bku	Gain Loss On Indemnification Asset GainLossOnIndemnificationAsset	0	USD
	bku	Gain Loss On Indemnification Asset GainLossOnIndemnificationAsset	-1925000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	4269000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	3723000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	12389000	USD
	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	26121000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	10811000	USD
CY2019Q3	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	5163000	USD
CY2018Q3	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	8691000	USD
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	10220000	USD
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	12960000	USD
CY2019Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	3835000	USD
CY2018Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	432000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	13736000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	2938000	USD
CY2019Q3	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	18583000	USD
CY2018Q3	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	14091000	USD
	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	52774000	USD
	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	45685000	USD
CY2019Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	6006000	USD
CY2018Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	5574000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	20329000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	17536000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	37856000	USD
CY2018Q3	us-gaap	Noninterest Income NoninterestIncome	38735000	USD
	us-gaap	Noninterest Income NoninterestIncome	109448000	USD
	us-gaap	Noninterest Income NoninterestIncome	98694000	USD
CY2019Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	57102000	USD
CY2018Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	65612000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	179586000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	198185000	USD
CY2019Q3	us-gaap	Occupancy Net OccupancyNet	14673000	USD
CY2018Q3	us-gaap	Occupancy Net OccupancyNet	13812000	USD
	us-gaap	Occupancy Net OccupancyNet	42477000	USD
	us-gaap	Occupancy Net OccupancyNet	42355000	USD
CY2019Q3	us-gaap	Fdic Indemnification Asset Accretion Of Discount FDICIndemnificationAssetAccretionOfDiscount	0	USD
CY2018Q3	us-gaap	Fdic Indemnification Asset Accretion Of Discount FDICIndemnificationAssetAccretionOfDiscount	48255000	USD
	us-gaap	Fdic Indemnification Asset Accretion Of Discount FDICIndemnificationAssetAccretionOfDiscount	0	USD
	us-gaap	Fdic Indemnification Asset Accretion Of Discount FDICIndemnificationAssetAccretionOfDiscount	132852000	USD
CY2019Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3781000	USD
CY2018Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	5375000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	12849000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	14810000	USD
CY2019Q3	us-gaap	Professional Fees ProfessionalFees	2923000	USD
CY2018Q3	us-gaap	Professional Fees ProfessionalFees	5240000	USD
	us-gaap	Professional Fees ProfessionalFees	17731000	USD
	us-gaap	Professional Fees ProfessionalFees	10772000	USD
CY2019Q3	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	10994000	USD
CY2018Q3	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	9262000	USD
	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	34175000	USD
CY2019Q3	us-gaap	Operating Leases Income Statement Depreciation Expense On Property Subject To Or Held For Lease OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease	11582000	USD
CY2018Q3	us-gaap	Operating Leases Income Statement Depreciation Expense On Property Subject To Or Held For Lease OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease	9870000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	16455000	USD
CY2018Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	13372000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	42584000	USD
	us-gaap	Operating Leases Income Statement Depreciation Expense On Property Subject To Or Held For Lease OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease	34883000	USD
	us-gaap	Operating Leases Income Statement Depreciation Expense On Property Subject To Or Held For Lease OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease	28662000	USD
CY2019Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-3796000	USD
CY2018Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-3796000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	40105000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	121306000	USD
CY2018Q3	us-gaap	Noninterest Expense NoninterestExpense	170798000	USD
	us-gaap	Noninterest Expense NoninterestExpense	368081000	USD
	us-gaap	Noninterest Expense NoninterestExpense	493862000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	100401000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	118705000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	299468000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	346530000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24182000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21377000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	75826000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	74067000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	76219000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	97328000	USD
	us-gaap	Net Income Loss NetIncomeLoss	223642000	USD
	us-gaap	Net Income Loss NetIncomeLoss	272463000	USD
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.78
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.90
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.23
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.50
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.77
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.90
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.23
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.49
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	76219000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	97328000	USD
	us-gaap	Net Income Loss NetIncomeLoss	223642000	USD
	us-gaap	Net Income Loss NetIncomeLoss	272463000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	8358000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-18147000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	53301000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-58577000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	2518000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-18529000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	44733000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-61551000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	382000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	8568000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	2974000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	5840000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-16774000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	10536000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-74667000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	40175000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	374000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	772000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	3616000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	617000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-17148000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	9764000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-78283000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	39558000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-11308000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-8765000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-33550000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-21993000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	64911000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	88563000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	190092000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	250470000	USD
	us-gaap	Net Income Loss NetIncomeLoss	223642000	USD
	us-gaap	Net Income Loss NetIncomeLoss	272463000	USD
	bku	Amortization Accretion Of Discounts And Premiums AmortizationAccretionOfDiscountsAndPremiums	30550000	USD
	bku	Amortization Accretion Of Discounts And Premiums AmortizationAccretionOfDiscountsAndPremiums	97064000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	9373000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	13342000	USD
	bku	Income Loss From Resolution Of Covered Assets IncomeLossFromResolutionOfCoveredAssets	0	USD
	bku	Income Loss From Resolution Of Covered Assets IncomeLossFromResolutionOfCoveredAssets	10689000	USD
	bku	Gain Loss On Indemnification Asset GainLossOnIndemnificationAsset	0	USD
	bku	Gain Loss On Indemnification Asset GainLossOnIndemnificationAsset	-1925000	USD
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	10220000	USD
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	12960000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	13736000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	2938000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	16967000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	18045000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	53105000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	51472000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	22278000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	60071000	USD
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	-3796000	USD
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	317027000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	182330000	USD
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	68665000	USD
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	125509000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-20288000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	77393000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-131066000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	130827000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	412239000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	403922000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	3176833000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	2557757000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1057043000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1134995000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	2297121000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	938555000	USD
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	319387000	USD
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	235876000	USD
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	313650000	USD
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	228438000	USD
	us-gaap	Payments To Acquire Loans Held For Investment PaymentsToAcquireLoansHeldForInvestment	1636932000	USD
	us-gaap	Payments To Acquire Loans Held For Investment PaymentsToAcquireLoansHeldForInvestment	913840000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-332246000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-320550000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	205869000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	250769000	USD
	us-gaap	Proceeds From Sale Of Machinery And Equipment ProceedsFromSaleOfMachineryAndEquipment	9404000	USD
	us-gaap	Proceeds From Sale Of Machinery And Equipment ProceedsFromSaleOfMachineryAndEquipment	50902000	USD
	us-gaap	Payments To Acquire Equipment On Lease PaymentsToAcquireEquipmentOnLease	38312000	USD
	us-gaap	Payments To Acquire Equipment On Lease PaymentsToAcquireEquipmentOnLease	137305000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	36409000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	16548000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-992540000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-937117000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	482205000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	426811000	USD
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	3962000000	USD
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	3847000000	USD
	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	0	USD
	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	-175000000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	3827000000	USD
	bku	Dividends Declared And Payable DividendsDeclaredAndPayable	22394000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	3672000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	63558000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	68911000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	150000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	150000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	24809000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	60512000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	428456000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	618412000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-151845000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	85217000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	382073000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	194582000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	230228000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	279799000	USD
	us-gaap	Interest Paid Net InterestPaidNet	391691000	USD
	us-gaap	Interest Paid Net InterestPaidNet	269520000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-264000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	21031000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	3211000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	9411000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	439525000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	54322000	USD
	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	19716000	USD
	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	0	USD
	bku	Dividends Declared And Payable DividendsDeclaredAndPayable	20524000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	88331000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	146503000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	2867910000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	64911000	USD
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	20524000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	4564000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value Share Based Compensation Forfeited StockIssuedDuringPeriodValueShareBasedCompensationForfeited	145000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	494000	USD
CY2019Q3	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	7935000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	2909275000	USD
CY2018Q2	us-gaap	Stockholders Equity StockholdersEquity	3099433000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	88563000	USD
CY2018Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	22393000	USD
CY2018Q3	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	5067000	USD
CY2018Q3	us-gaap	Stock Issued During Period Value Share Based Compensation Forfeited StockIssuedDuringPeriodValueShareBasedCompensationForfeited	181000	USD
CY2018Q3	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	95601000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	3074888000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	2923833000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	190092000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	62409000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	13620000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation Forfeited StockIssuedDuringPeriodValueShareBasedCompensationForfeited	6399000	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	538000	USD
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	150000000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	2909275000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	3026062000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	250470000	USD
CY2018Q3	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	3771000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	68250000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	15409000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation Forfeited StockIssuedDuringPeriodValueShareBasedCompensationForfeited	6530000	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	7727000	USD
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	150000000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	3074888000	USD
	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-bottom:10px;padding-top:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:Times New Roman;font-size:10pt;font-style:italic;font-weight:bold;text-decoration:none;">Accounting Estimates</span></div><div style="line-height:120%;padding-bottom:10px;padding-top:10px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, and expenses and disclosures of contingent assets and liabilities. Actual results could differ significantly from these estimates.</span></div><div style="line-height:120%;padding-bottom:10px;padding-top:10px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Significant estimates include the ALLL and the fair values of investment securities and other financial instruments. </span></div>
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	95000000	USD
	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	76219000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	97328000	USD
	us-gaap	Net Income Loss NetIncomeLoss	223642000	USD
	us-gaap	Net Income Loss NetIncomeLoss	272463000	USD
CY2019Q3	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	3174000	USD
	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	9247000	USD
	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	10444000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	73045000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	93557000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	214395000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	262019000	USD
CY2019Q3	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	95075395	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	105063770	shares
	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	97113878	shares
	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	105914807	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Common Stock Subject To Repurchase Or Cancellation WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation	1098509	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Common Stock Subject To Repurchase Or Cancellation WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation	1178982	shares
	us-gaap	Weighted Average Number Of Shares Common Stock Subject To Repurchase Or Cancellation WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation	1147988	shares
	us-gaap	Weighted Average Number Of Shares Common Stock Subject To Repurchase Or Cancellation WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation	1170209	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	93976886	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	103884788	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	95965890	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	104744598	shares
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.78
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.90
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.23
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.50
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	73045000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	93557000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	214395000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	262019000	USD
CY2019Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-7000	USD
CY2018Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-13000	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-20000	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-37000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	73052000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	93570000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	214415000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	262056000	USD
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	93976886	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	103884788	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	95965890	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	104744598	shares
CY2019Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	285934	shares
CY2018Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	499431	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	303524	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	512801	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	94262820	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	104384219	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	96269414	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	105257399	shares
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.77
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.90
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.23
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.49
CY2019Q3	bku	Dividend Equivalent Rights DividendEquivalentRights	3023314	shares
CY2019Q3	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	7834107000	USD
CY2019Q3	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	82973000	USD
CY2019Q3	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	16407000	USD
CY2019Q3	us-gaap	Available For Sale Securities AvailableForSaleSecurities	7900673000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale And Held To Maturity DebtSecuritiesAvailableForSaleAndHeldToMaturity	7844107000	USD
CY2019Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	7910673000	USD
CY2019Q3	us-gaap	Investments Investments	7970656000	USD
CY2018Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	8090654000	USD
CY2018Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	49030000	USD
CY2018Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	43325000	USD
CY2018Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	8096359000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale And Held To Maturity DebtSecuritiesAvailableForSaleAndHeldToMaturity	8100654000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	8106359000	USD
CY2018Q4	us-gaap	Investments Investments	8166878000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	677040000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	683994000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	4298108000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	4318504000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	2438854000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	2468533000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	420105000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	429642000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	7834107000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	7900673000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	2100000000	USD
CY2019Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	670871000	USD
CY2018Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	102238000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	2297121000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	938555000	USD
CY2019Q3	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	6094000	USD
CY2018Q3	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	521000	USD
	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	15051000	USD
	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	6561000	USD
CY2019Q3	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	2669000	USD
CY2018Q3	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	3394000	USD
	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	2514000	USD
CY2019Q3	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	3425000	USD
CY2018Q3	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	521000	USD
	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	11657000	USD
	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	4047000	USD
CY2019Q3	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	-410000	USD
CY2018Q3	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	89000	USD
	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	-2079000	USD
	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	1109000	USD
CY2019Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	3835000	USD
CY2018Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	432000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	13736000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	2938000	USD
CY2019Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1791610000	USD
CY2019Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	8406000	USD
CY2019Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	626639000	USD
CY2019Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	8001000	USD
CY2019Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	2418249000	USD
CY2019Q3	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	16407000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	3658094000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	28077000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	593775000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	15248000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	4251869000	USD
CY2018Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	43325000	USD
CY2019Q3	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	115	security
CY2019Q3	bku	Number Of Securities Amount Of Impairment Insignificant NumberOfSecuritiesAmountOfImpairmentInsignificant	41	security
CY2019Q3	bku	Availableforsalesecurities Gross Unrealized Loss Considered Insignificantfor Otti Analysis AvailableforsalesecuritiesGrossUnrealizedLossConsideredInsignificantforOTTIAnalysis	346000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	22855500000	USD
CY2019Q3	bku	Percent Of Total Loans PercentOfTotalLoans	1.000
CY2018Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	21977008000	USD
CY2018Q4	bku	Percent Of Total Loans PercentOfTotalLoans	1.000
CY2019Q3	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	108462000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	109931000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	22747038000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	21867077000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	52000000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	44000000	USD
CY2019Q3	us-gaap	Pledged Financial Instruments Not Separately Reported Loans Receivable Pledged For Federal Home Loan Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedForFederalHomeLoanBankDebt	10400000000	USD
CY2019Q3	bku	Unpaid Principal Balance Of Aci Loans UnpaidPrincipalBalanceOfAciLoans	343000000	USD
CY2018Q4	bku	Unpaid Principal Balance Of Aci Loans UnpaidPrincipalBalanceOfAciLoans	408000000	USD
CY2019Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	112141000	USD
CY2018Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	134971000	USD
CY2019Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1839000	USD
CY2018Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1200000	USD
CY2019Q3	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	6141000	USD
CY2018Q3	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	13080000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	129243000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	2000000.0	USD
CY2019Q3	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	623000	USD
CY2018Q3	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	1649000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	108462000	USD
CY2018Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	124740000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	109931000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	144795000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	9373000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	13342000	USD
	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	13985000	USD
	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	35980000	USD
	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	3143000	USD
	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	2583000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	108462000	USD
CY2018Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	124740000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	108462000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	109931000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	9942000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	12277000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	98520000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	97654000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	22855500000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	21977008000	USD
CY2019Q3	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	158775000	USD
CY2018Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	116531000	USD
CY2019Q3	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	22518732000	USD
CY2018Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	21652329000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	158775000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	158783000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	9942000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	116531000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	116285000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	12277000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	148235000	USD
CY2018Q3	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	188463000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	136226000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	182611000	USD
CY2019Q3	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	137645000	USD
	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	6000000.0	USD
CY2018Q3	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	2100000	USD
	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	5000000.0	USD
CY2019Q3	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	22295762000	USD
CY2019Q3	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	22855500000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	21676200000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	21977008000	USD
CY2019Q3	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	421000000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	219000000	USD
CY2019Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	137
CY2019Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	39655000	USD
CY2019Q3	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	61
CY2019Q3	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	11767000	USD
CY2018Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	16
CY2018Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	8163000	USD
CY2018Q3	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	5
CY2018Q3	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	526000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	186
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	77164000	USD
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	65
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	14954000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	36
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	13558000	USD
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	6
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	626000	USD
CY2019Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	92797000	USD
CY2019Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	6509000	USD
CY2019Q3	bku	Total Rightof Use Asset TotalRightofUseAsset	99306000	USD
CY2019Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	102609000	USD
CY2019Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	8920000	USD
CY2019Q3	bku	Total Lease Liabilities TotalLeaseLiabilities	111529000	USD
CY2019Q3	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	256000	USD
CY2019Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y8M15D
CY2019Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P6Y25D
CY2019Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.033
CY2019Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.117
CY2019Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	5095000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	15175000	USD
CY2019Q3	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	631000	USD
	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	1278000	USD
CY2019Q3	us-gaap	Lease Cost LeaseCost	5726000	USD
	us-gaap	Lease Cost LeaseCost	16453000	USD
CY2019Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	434000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1143000	USD
CY2019Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	256000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	761000	USD
CY2019Q3	bku	Totalfinanceleasecost Totalfinanceleasecost	690000	USD
	bku	Totalfinanceleasecost Totalfinanceleasecost	1904000	USD
CY2019Q3	us-gaap	Variable Lease Cost VariableLeaseCost	1036000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	3016000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	761000	USD
CY2019Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	5225000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	15584000	USD
CY2019Q3	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	579000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2040000	USD
CY2019Q3	bku	Totalcashpaidforamountsincludedinthemeasurementofleaseliabilities Totalcashpaidforamountsincludedinthemeasurementofleaseliabilities	6060000	USD
	bku	Totalcashpaidforamountsincludedinthemeasurementofleaseliabilities Totalcashpaidforamountsincludedinthemeasurementofleaseliabilities	18385000	USD
CY2019Q3	bku	Operatingleaseliabilitiesrecognizedfromobtaining Ro Uassets OperatingleaseliabilitiesrecognizedfromobtainingROUassets	10114000	USD
	bku	Operatingleaseliabilitiesrecognizedfromobtaining Ro Uassets OperatingleaseliabilitiesrecognizedfromobtainingROUassets	11711000	USD
CY2019Q3	bku	Financeleaseliabilitiesrecognizedfromobtaining Ro Uassets FinanceleaseliabilitiesrecognizedfromobtainingROUassets	317000	USD
	bku	Financeleaseliabilitiesrecognizedfromobtaining Ro Uassets FinanceleaseliabilitiesrecognizedfromobtainingROUassets	1838000	USD
CY2019Q3	bku	Totalleaseliabilitiesrecognizedfromobtaining Ro Uassets TotalleaseliabilitiesrecognizedfromobtainingROUassets	10431000	USD
	bku	Totalleaseliabilitiesrecognizedfromobtaining Ro Uassets TotalleaseliabilitiesrecognizedfromobtainingROUassets	117613000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	5190000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	469000	USD
CY2019Q3	bku	Total Lease Liability Payments Remainderof Fiscal Year TotalLeaseLiabilityPaymentsRemainderofFiscalYear	5659000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	19375000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	2564000	USD
CY2019Q3	bku	Total Lease Liability Payments Due Year Two TotalLeaseLiabilityPaymentsDueYearTwo	21939000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	17747000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	2622000	USD
CY2019Q3	bku	Total Lease Liability Payments Due Year Three TotalLeaseLiabilityPaymentsDueYearThree	20369000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	14548000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	2053000	USD
CY2019Q3	bku	Total Lease Liability Payments Due Year Four TotalLeaseLiabilityPaymentsDueYearFour	16601000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	12479000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	2124000	USD
CY2019Q3	bku	Total Lease Liability Payments Due Year Five TotalLeaseLiabilityPaymentsDueYearFive	-14603000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	47266000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	2825000	USD
CY2019Q3	bku	Total Lease Liability Payments Due After Year Five TotalLeaseLiabilityPaymentsDueAfterYearFive	50091000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	116605000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	12657000	USD
CY2019Q3	bku	Total Lease Liability Payments Due TotalLeaseLiabilityPaymentsDue	129262000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	13996000	USD
CY2019Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	3737000	USD
CY2019Q3	bku	Total Lease Liability Undiscounted Excess Amount TotalLeaseLiabilityUndiscountedExcessAmount	-17733000	USD
CY2019Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	102609000	USD
CY2019Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	8920000	USD
CY2019Q3	bku	Total Lease Liabilities TotalLeaseLiabilities	111529000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	21207000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	17629000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	15858000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	12114000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	10311000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	42984000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	120103000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	799832000	USD
CY2018Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	808921000	USD
CY2019Q3	us-gaap	Direct Financing Lease Unguaranteed Residual Asset DirectFinancingLeaseUnguaranteedResidualAsset	8471000	USD
CY2018Q4	us-gaap	Direct Financing Lease Unguaranteed Residual Asset DirectFinancingLeaseUnguaranteedResidualAsset	7355000	USD
CY2019Q3	bku	Salestypeordirectfinancingleasegrossinvestment Salestypeordirectfinancingleasegrossinvestment	808303000	USD
CY2018Q4	bku	Salestypeordirectfinancingleasegrossinvestment Salestypeordirectfinancingleasegrossinvestment	816276000	USD
CY2019Q3	us-gaap	Direct Financing Lease Deferred Selling Profit DirectFinancingLeaseDeferredSellingProfit	82761000	USD
CY2018Q4	us-gaap	Direct Financing Lease Deferred Selling Profit DirectFinancingLeaseDeferredSellingProfit	81864000	USD
CY2019Q3	us-gaap	Capital Leases Net Investment In Direct Financing Leases Initial Direct Costs CapitalLeasesNetInvestmentInDirectFinancingLeasesInitialDirectCosts	4484000	USD
CY2018Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases Initial Direct Costs CapitalLeasesNetInvestmentInDirectFinancingLeasesInitialDirectCosts	4833000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable SalesTypeAndDirectFinancingLeasesLeaseReceivable	730026000	USD
CY2018Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable SalesTypeAndDirectFinancingLeasesLeaseReceivable	739245000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Remainder Of Fiscal Year SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear	35849000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Two Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears	200817000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Three Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears	141337000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Four Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears	93893000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Five Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears	72586000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Thereafter SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter	255350000	USD
CY2019Q3	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	799832000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Receivable Remainder Of Fiscal Year OperatingLeasesFutureMinimumPaymentsReceivableRemainderOfFiscalYear	15837000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	58339000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	49122000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	42335000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Receivable In Five Years OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears	35027000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Receivable Thereafter OperatingLeasesFutureMinimumPaymentsReceivableThereafter	107970000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Receivable OperatingLeasesFutureMinimumPaymentsReceivable	308630000	USD
CY2019Q3	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	18583000	USD
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	52774000	USD
CY2019Q3	us-gaap	Direct Financing Lease Lease Income DirectFinancingLeaseLeaseIncome	5683000	USD
	us-gaap	Direct Financing Lease Lease Income DirectFinancingLeaseLeaseIncome	16481000	USD
CY2019Q3	us-gaap	Lease Income LeaseIncome	24266000	USD
	us-gaap	Lease Income LeaseIncome	69255000	USD
CY2019Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.241
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.253
CY2018Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.180
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.214
CY2019Q3	us-gaap	Gain Loss On Interest Rate Derivative Instruments Not Designated As Hedging Instruments GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments	1300000	USD
	us-gaap	Gain Loss On Interest Rate Derivative Instruments Not Designated As Hedging Instruments GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments	4300000	USD
CY2018Q3	us-gaap	Gain Loss On Interest Rate Derivative Instruments Not Designated As Hedging Instruments GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments	500000	USD
	us-gaap	Gain Loss On Interest Rate Derivative Instruments Not Designated As Hedging Instruments GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments	1200000	USD
CY2019Q3	bku	Interestratederivativecontractscentrallyclearedthroughthe Cme InterestratederivativecontractscentrallyclearedthroughtheCME	0	USD
CY2019Q3	invest	Derivative Notional Amount DerivativeNotionalAmount	5923050000	USD
CY2019Q3	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	56580000	USD
CY2019Q3	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	23963000	USD
CY2018Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	5139206000	USD
CY2018Q4	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	29615000	USD
CY2018Q4	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	23874000	USD
CY2019Q3	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	17700000	USD
CY2019Q3	us-gaap	Increase Decrease In Fair Value Of Interest Rate Fair Value Hedging Instruments1 IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1	382000	USD
	us-gaap	Increase Decrease In Fair Value Of Interest Rate Fair Value Hedging Instruments1 IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1	382000	USD
CY2019Q3	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge1 ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1	362000	USD
	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge1 ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1	362000	USD
CY2019Q3	us-gaap	Gain Loss On Fair Value Hedge Ineffectiveness Net GainLossOnFairValueHedgeIneffectivenessNet	-20000	USD
	us-gaap	Gain Loss On Fair Value Hedge Ineffectiveness Net GainLossOnFairValueHedgeIneffectivenessNet	-20000	USD
CY2019Q3	us-gaap	Hedged Liability Fair Value Hedge HedgedLiabilityFairValueHedge	250000000	USD
CY2019Q3	us-gaap	Hedged Liability Fair Value Hedge Cumulative Increase Decrease HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease	-362000	USD
CY2019Q3	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	299000	USD
CY2019Q3	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	0	USD
CY2019Q3	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	299000	USD
CY2019Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	299000	USD
CY2019Q3	us-gaap	Derivative Asset Fair Value Of Collateral DerivativeAssetFairValueOfCollateral	0	USD
CY2019Q3	bku	Derivative Asset Net Amount Not Offset DerivativeAssetNetAmountNotOffset	0	USD
CY2019Q3	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	23656000	USD
CY2019Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	0	USD
CY2019Q3	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	23656000	USD
CY2019Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	299000	USD
CY2019Q3	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	23441000	USD
CY2019Q3	bku	Derivative Liability Net Amount Not Offset DerivativeLiabilityNetAmountNotOffset	-84000	USD
CY2019Q3	bku	Gross Amounts Recognized Derivative Assets And Liabilities GrossAmountsRecognizedDerivativeAssetsAndLiabilities	-23357000	USD
CY2019Q3	bku	Derivative Asset Liability Collateral Offset DerivativeAssetLiabilityCollateralOffset	0	USD
CY2019Q3	bku	Derivative Asset Liability Fair Value Amount Not Offset Against Collateral DerivativeAssetLiabilityFairValueAmountNotOffsetAgainstCollateral	-23357000	USD
CY2019Q3	bku	Derivative Asset Liability Fair Value Gross Liability Asset DerivativeAssetLiabilityFairValueGrossLiabilityAsset	0	USD
CY2019Q3	bku	Derivative Asset Liability Fair Value Of Collateral DerivativeAssetLiabilityFairValueOfCollateral	-23441000	USD
CY2019Q3	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	84000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	18297000	USD
CY2018Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	0	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	18297000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	5264000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Of Collateral DerivativeAssetFairValueOfCollateral	13129000	USD
CY2018Q4	bku	Derivative Asset Net Amount Not Offset DerivativeAssetNetAmountNotOffset	-96000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	6991000	USD
CY2018Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	0	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	6991000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	5264000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	436000	USD
CY2018Q4	bku	Derivative Liability Net Amount Not Offset DerivativeLiabilityNetAmountNotOffset	1291000	USD
CY2018Q4	bku	Gross Amounts Recognized Derivative Assets And Liabilities GrossAmountsRecognizedDerivativeAssetsAndLiabilities	11306000	USD
CY2018Q4	bku	Derivative Asset Liability Collateral Offset DerivativeAssetLiabilityCollateralOffset	0	USD
CY2018Q4	bku	Derivative Asset Liability Fair Value Amount Not Offset Against Collateral DerivativeAssetLiabilityFairValueAmountNotOffsetAgainstCollateral	11306000	USD
CY2018Q4	bku	Derivative Asset Liability Fair Value Gross Liability Asset DerivativeAssetLiabilityFairValueGrossLiabilityAsset	0	USD
CY2018Q4	bku	Derivative Asset Liability Fair Value Of Collateral DerivativeAssetLiabilityFairValueOfCollateral	12693000	USD
CY2018Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	-1387000	USD
CY2019Q3	bku	Financialcollateralpledgedforinterestrateswaps Financialcollateralpledgedforinterestrateswaps	25000000.0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	11372000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	3014000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	8358000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-24690000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-6543000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-18147000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	3426000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	908000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	2518000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	520000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	138000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	382000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	7946000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	2106000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	5840000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-25210000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-6681000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-18529000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-22822000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-6048000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-16774000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	14335000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	3799000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	10536000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	509000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	135000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	374000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	1050000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	278000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	772000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	-23331000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	-6183000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-17148000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	13285000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	3521000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	9764000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-15385000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-4077000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-11308000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-11925000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-3160000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-8765000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	72519000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	19218000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	53301000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-79697000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-21120000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-58577000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	11657000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	3089000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	8568000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	4047000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1073000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	2974000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	60862000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	16129000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	44733000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-83744000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-22193000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-61551000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-101588000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-26921000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-74667000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	54660000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	14485000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	40175000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	4920000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	1304000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	3616000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	839000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	222000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	617000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	-106508000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	-28225000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-78283000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	53821000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	14263000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	39558000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-45646000	USD
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-12096000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-33550000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-29923000	USD
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-7930000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-21993000	USD
CY2019Q1	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	4400000	shares
CY2019Q1	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	150000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	4873000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-33550000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-28677000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	54986000	USD
	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification	8902000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-21993000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	41895000	USD
	bku	Stock Repurchase Weighted Average Priceof Shares Repurchasedduringperiod StockRepurchaseWeightedAveragePriceofSharesRepurchasedduringperiod	34.39	USD
CY2019Q1	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	150000000	USD
	bku	Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Grant Date Fair Value Vested SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateGrantDateFairValueVested	20616000	USD
	bku	Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Grant Date Fair Value Vested SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateGrantDateFairValueVested	18341000	USD
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	964840	shares
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	26.53
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	26043	shares
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	20.63
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	1960	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	63.74
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	936837	shares
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	26.62
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1270688	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	26.93
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	291689	shares
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	26.49
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	978999	shares
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	27.07
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	400000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	4600000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions	1100000	USD
CY2019Q3	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	8025867000	USD
CY2019Q3	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	23963000	USD
CY2018Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	8196018000	USD
CY2018Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	23874000	USD
CY2019Q3	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	7971340000	USD
CY2018Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	8167127000	USD
CY2019Q3	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	4305778000	USD

Files In Submission

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$BKU
BankUnited, Inc. Stock $bku

2019 Q4 Form 10-Q Financial Statement

#000150400819000037 Filed on November 08, 2019

Income Statement

Balance Sheet

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Facts In Submission

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$BKU BankUnited, Inc. Stock $bku

2019 Q4 Form 10-Q Financial Statement

#000150400819000037 Filed on November 08, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BKU
BankUnited, Inc. Stock $bku