$NBBK
NB Bancorp, Inc. Stock $nbbk

$nbbk Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000155837024004193 Filed on March 28, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$68.19M	$63.98M	$220.5M
YoY Change	49.65%	61.22%	81.07%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin	$21.87M	$47.20M	$7.595M
YoY Change	15.64%	201.98%	-87.19%
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$695.0K	$672.0K	$2.700M
YoY Change			14.26%
% of Gross Profit
Operating Expenses	$26.62M	$53.25M	$7.595M
YoY Change	47.11%	188.37%	-89.01%
Operating Profit
YoY Change
Interest Expense	$29.56M	-$29.02M	$90.44M
YoY Change	-299.74%	237.29%	-681.71%
% of Operating Profit
Other Income/Expense, Net	-$361.0K	-$1.863M	-$4.707M
YoY Change	-47.83%	235.68%	157.35%
Pretax Income	$12.14M	-$20.16M	$11.84M
YoY Change	1.33%	-267.21%	-67.45%
Income Tax	$3.439M	-$6.542M	$2.019M
% Of Pretax Income	28.33%		17.05%
Net Earnings	$8.701M	-$13.62M	$9.825M
YoY Change	-0.58%	-213.23%	-67.32%
Net Earnings / Revenue	12.76%	-21.29%	4.46%
Basic Earnings Per Share	$0.22		$0.23
Diluted Earnings Per Share	$0.22	-$0.30	$0.23
COMMON SHARES
Basic Shares Outstanding	42.71M	0.000	42.02M
Diluted Shares Outstanding	39.69M		42.02M

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$163.7M	$90.49M	$90.49M
YoY Change	79.42%		-30.97%
Cash & Equivalents	$315.0M	$272.6M	$90.49M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$181.5M	$107.8M	$107.8M
YoY Change	76.43%		-24.06%
LONG-TERM ASSETS
Property, Plant & Equipment	$35.11M	$35.53M	$46.08M
YoY Change	-2.27%	0.53%	30.37%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$386.8M	$410.2M	$410.2M
YoY Change	42.07%		35.44%
Other Assets	$13.86M	$14.20M	$14.20M
YoY Change	34.43%		30.51%
Total Long-Term Assets	$4.469B	$4.426B	$4.426B
YoY Change	23.67%		28.26%
TOTAL ASSETS
Total Short-Term Assets	$181.5M	$107.8M	$107.8M
Total Long-Term Assets	$4.469B	$4.426B	$4.426B
Total Assets	$4.650B	$4.533B	$4.533B
YoY Change	25.13%	26.2%	26.2%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$78.99M	$100.5M	$100.5M
YoY Change	32.8%		56.16%
Deferred Revenue
YoY Change
Short-Term Debt	$3.772B	$3.670B	$3.670B
YoY Change	20.1%		27.13%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$3.851B	$3.770B	$3.770B
YoY Change	20.33%		27.76%
LONG-TERM LIABILITIES
Long-Term Debt	$60.84M	$835.0K	$835.0K
YoY Change	-62.0%		-99.72%
Other Long-Term Liabilities	$4.300M	$4.229M	$4.229M
YoY Change	11.2%		4.06%
Total Long-Term Liabilities	$65.14M	$5.064M	$5.064M
YoY Change	-60.27%		-98.3%
TOTAL LIABILITIES
Total Short-Term Liabilities	$3.851B	$3.770B	$3.770B
Total Long-Term Liabilities	$65.14M	$5.064M	$5.064M
Total Liabilities	$3.916B	$3.775B	$3.775B
YoY Change	16.41%	16.23%	16.23%
SHAREHOLDERS EQUITY
Retained Earnings	$374.9M	$366.2M
YoY Change		2.15%
Common Stock	$427.0K	$427.0K
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$733.8M	$758.0M	$758.0M
YoY Change
Total Liabilities & Shareholders Equity	$4.650B	$4.533B	$4.533B
YoY Change	25.13%	26.2%	26.2%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$8.701M	-$13.62M	$9.825M
YoY Change	-0.58%	-213.23%	-67.32%
Depreciation, Depletion And Amortization	$695.0K	$672.0K	$2.700M
YoY Change			14.26%
Cash From Operating Activities	-$11.58M	$13.28M	$52.96M
YoY Change	-239.07%		33.35%
INVESTING ACTIVITIES
Capital Expenditures	$270.0K	$239.0K	$2.865M
YoY Change	-80.58%		-66.29%
Acquisitions
YoY Change
Other Investing Activities	-$74.36M	-$166.6M	-$828.8M
YoY Change			25.67%
Cash From Investing Activities	-$74.63M	-$166.9M	-$831.6M
YoY Change	-61.51%		24.5%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$417.5M
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	128.7M	292.4M	894.7M
YoY Change	6.42%		181.56%
NET CHANGE
Cash From Operating Activities	-11.58M	13.28M	52.96M
Cash From Investing Activities	-74.63M	-166.9M	-831.6M
Cash From Financing Activities	128.7M	292.4M	894.7M
Net Change In Cash	42.44M	138.8M	116.0M
YoY Change	-165.62%		-137.37%
FREE CASH FLOW
Cash From Operating Activities	-$11.58M	$13.28M	$52.96M
Capital Expenditures	$270.0K	$239.0K	$2.865M
Free Cash Flow	-$11.85M	$13.04M	$50.09M
YoY Change	-270.83%		60.48%

Facts In Submission

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CY2023	dei	Entity File Number EntityFileNumber	001-41899
CY2023	dei	Entity Registrant Name EntityRegistrantName	NB BANCORP, INC.
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
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CY2022	us-gaap	Marketing Expense MarketingExpense	2338000
CY2023	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4707000
CY2022	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1829000
CY2023	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	4848000
CY2022	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	3683000
CY2023	us-gaap	Noninterest Expense NoninterestExpense	119905000
CY2022	us-gaap	Noninterest Expense NoninterestExpense	71151000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	11844000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	36388000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2019000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6323000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	9825000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	30065000
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	42018229
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2023	us-gaap	Net Income Loss NetIncomeLoss	9825000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	30065000
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	3740000
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-17657000
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	106000
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	200000
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-321000
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	1548000
CY2023	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	3313000
CY2022	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-16309000
CY2023	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	809000
CY2022	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-4180000
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2504000
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-12129000
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	12329000
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	17936000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	326129000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	30065000
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-12129000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	344065000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	9825000
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2504000
CY2023	nbbk	Stock Issued Issuance Costs StockIssuedIssuanceCosts	9600000
CY2023	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	400375000
CY2023	nbbk	Stock Issued During Period Value Issued Charity StockIssuedDuringPeriodValueIssuedCharity	17082000
CY2023	nbbk	Shares Puchase By Employee Stock Ownership Plan Shares SharesPuchaseByEmployeeStockOwnershipPlanShares	1000000
CY2023	nbbk	Shares Purchase By Employee Stock Ownership Plan Value SharesPurchaseByEmployeeStockOwnershipPlanValue	13774000
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	757959000
CY2023	us-gaap	Profit Loss ProfitLoss	9825000
CY2022	us-gaap	Profit Loss ProfitLoss	30065000
CY2023	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	240000
CY2022	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-71000
CY2022	us-gaap	Business Combination Bargain Purchase Gain Recognized Amount BusinessCombinationBargainPurchaseGainRecognizedAmount	1070000
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	149000
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	111000
CY2023	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	13885000
CY2022	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	6700000
CY2023	nbbk	Fair Value Adjustments Of Loan Hedged Including Amortization FairValueAdjustmentsOfLoanHedgedIncludingAmortization	161000
CY2022	nbbk	Fair Value Adjustments Of Loan Hedged Including Amortization FairValueAdjustmentsOfLoanHedgedIncludingAmortization	502000
CY2023	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	-4419000
CY2022	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	-2522000
CY2023	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	2400000
CY2022	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	1840000
CY2023	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	2405000
CY2022	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	1887000
CY2023	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	5000
CY2022	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	47000
CY2023	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	2678000
CY2022	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	2363000
CY2023	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	1510000
CY2022	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	1157000
CY2023	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-7720000
CY2022	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-1253000
CY2023	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	6447000
CY2022	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	3299000
CY2023	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-3909000
CY2022	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	22800000
CY2023	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-4134000
CY2022	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	4149000
CY2023	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	22591000
CY2022	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	27221000
CY2023	nbbk	Increase Decrease In Accrued Retirement Liabilities IncreaseDecreaseInAccruedRetirementLiabilities	7125000
CY2022	nbbk	Increase Decrease In Accrued Retirement Liabilities IncreaseDecreaseInAccruedRetirementLiabilities	3887000
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	52959000
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	39714000
CY2023	nbbk	Proceeds From Loan Originations Net Of Repayments ProceedsFromLoanOriginationsNetOfRepayments	882036000
CY2022	nbbk	Proceeds From Loan Originations Net Of Repayments ProceedsFromLoanOriginationsNetOfRepayments	913800000
CY2023	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	43590000
CY2022	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	174053000
CY2023	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	103585000
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	170595000
CY2023	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	1376000
CY2022	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	10896000
CY2023	us-gaap	Payments To Acquire Federal Reserve Stock PaymentsToAcquireFederalReserveStock	2219000
CY2022	us-gaap	Payments To Acquire Federal Reserve Stock PaymentsToAcquireFederalReserveStock	508000
CY2023	nbbk	Payments For Proceeds From Non Public Investments PaymentsForProceedsFromNonPublicInvestments	-3121000
CY2022	nbbk	Payments For Proceeds From Non Public Investments PaymentsForProceedsFromNonPublicInvestments	-6306000
CY2022	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	297671000
CY2022	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	22198000
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2865000
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	8498000
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-831622000
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-667993000
CY2023	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	500605000
CY2022	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	24534000
CY2023	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	165000
CY2022	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	414000
CY2023	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	417457000
CY2023	nbbk	Payments For Purchase Of Common Shares By Employee Stock Ownership Plan PaymentsForPurchaseOfCommonSharesByEmployeeStockOwnershipPlan	13774000
CY2023	us-gaap	Increase Decrease In Loans From Other Federal Home Loan Banks IncreaseDecreaseInLoansFromOtherFederalHomeLoanBanks	-9744000
CY2022	us-gaap	Increase Decrease In Loans From Other Federal Home Loan Banks IncreaseDecreaseInLoansFromOtherFederalHomeLoanBanks	292826000
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	894709000
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	317774000
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	116046000
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-310505000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	156545000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	467050000
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	272591000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	156545000
CY2023	us-gaap	Interest Paid Net InterestPaidNet	88746000
CY2022	us-gaap	Interest Paid Net InterestPaidNet	6585000
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4791000
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	8561000
CY2023	nbbk	Noncash Cumulative Effect Adjustment Due To Adoption Of Net Of Income Taxes NoncashCumulativeEffectAdjustmentDueToAdoptionOfNetOfIncomeTaxes	-2118000
CY2022	nbbk	Noncash Initial Recognition Of Right Of Use Assets NoncashInitialRecognitionOfRightOfUseAssets	-1505000
CY2022	nbbk	Noncash Initial Recognition Of Operating Lease Liabilities NoncashInitialRecognitionOfOperatingLeaseLiabilities	1505000
CY2023	us-gaap	Debt Securities Available For Sale Unrealized Gain Loss DebtSecuritiesAvailableForSaleUnrealizedGainLoss	731000
CY2022	us-gaap	Debt Securities Available For Sale Unrealized Gain Loss DebtSecuritiesAvailableForSaleUnrealizedGainLoss	-19006000
CY2023	nbbk	Unrecognized Pension Losses On Director Pension Plan UnrecognizedPensionLossesOnDirectorPensionPlan	106000
CY2023	us-gaap	Unrealized Gain Loss On Cash Flow Hedging Instruments UnrealizedGainLossOnCashFlowHedgingInstruments	-321000
CY2022	us-gaap	Unrealized Gain Loss On Cash Flow Hedging Instruments UnrealizedGainLossOnCashFlowHedgingInstruments	1814000
CY2023Q4	nbbk	Stock Issued During Period Issued Charity Shares New Issues StockIssuedDuringPeriodIssuedCharitySharesNewIssues	1708229
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	42705729
CY2023	us-gaap	Stock Issued During Period Shares Employee Stock Ownership Plan StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan	1000000
CY2023Q4	nbbk	Plan Of Conversion Conversion Costs Incurred PlanOfConversionConversionCostsIncurred	9600000
CY2023	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;text-indent:0pt;margin:0pt 0pt 12pt 0pt;"><b style="font-weight:bold;">Use of Estimates</b></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;text-indent:0pt;margin:0pt 0pt 12pt 0pt;">The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported amounts of revenues and expenses. Actual results could differ from those estimates.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;text-indent:0pt;margin:0pt 0pt 12pt 0pt;">Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for credit losses, the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans, the valuation of deferred tax assets, actuarial estimates related to the Company’s various retirement programs, and the valuation of financial instruments. In connection with the determination of the allowances for credit losses on loans and foreclosed real estate, management obtains independent appraisals for significant properties.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;text-indent:0pt;margin:0pt 0pt 12pt 0pt;">A majority of the Company's loan portfolio consists of one to four-family residential, commercial real estate, construction and land development loans in the metro-west area of Boston and its surrounding communities. Accordingly, the ultimate collectability of a substantial portion of the Company's loan portfolio and the recovery of the carrying amount of foreclosed real estate are susceptible to changes in local market conditions.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;text-indent:0pt;margin:0pt 0pt 12pt 0pt;">While management uses currently available information to recognize losses on loans and foreclosed real estate, future additions to the allowances for credit losses on loans and foreclosed real estate may be necessary based on changes in local economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowances for credit losses on loans and foreclosed real estate. Such agencies may require the Company to recognize additions to the allowances based on their judgments about information available to them at the time of their examination. Because of these factors, it is reasonably possible that the allowance for losses on loans and foreclosed real estate may change in the near future.</p>
CY2023Q4	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	16100000
CY2022Q4	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	9700000
CY2023Q4	nbbk	Peer Group Financial Institutions Size PeerGroupFinancialInstitutionsSize	10000000000.00
CY2023Q4	nbbk	Financing Receivable Excluding Accrued Interest Allowance For Credit Losses Individually Evaluated For Impairment Threshold Amount FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossesIndividuallyEvaluatedForImpairmentThresholdAmount	500000
CY2023	nbbk	Financing Receivable Non Accrual Loans Percentage Excluded From Individually Evaluated Loans FinancingReceivableNonAccrualLoansPercentageExcludedFromIndividuallyEvaluatedLoans	0.75
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0
CY2023Q4	nbbk	Debt Securities Available For Sale Accrued Interest DebtSecuritiesAvailableForSaleAccruedInterest	1200000
CY2023	nbbk	Other Investments Policy Text Block Textblock OtherInvestmentsPolicyTextBlockTextblock	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;text-indent:0pt;margin:0pt 0pt 12pt 0pt;"><b style="font-weight:bold;">Other Investments – </b>Investments in mutually-owned banking organizations (Depositors Insurance Fund, Federal Home Loan Bank and Federal Reserve Bank), cooperative organizations (Connecticut On-Line Computer Center “COCC”), and non-controlling interests in privately-held companies (Jassby, Reinventure Capital, and LearnLaunch Fund), have no quoted market values and are carried at original cost, less any estimated impairment. Interest and dividends on these investments are recognized as earned or when dividends are declared. The Company reviews the above-mentioned stock for impairment based on the ultimate recoverability of their cost. As of December 31, 2023 and 2022, there was no allowance for credit losses related to other investments.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;text-indent:0pt;margin:0pt 0pt 12pt 0pt;">A non-controlling partnership interest in the Massachusetts Housing Equity Fund XXII LLC (a Qualified Affordable Housing Project “QAHP” of the Massachusetts Housing Investment Corporation), is accounted for using the proportional amortization method, whereby the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance as a component of income tax expense. The Company’s interest in the Massachusetts Housing Equity Fund XXII LLC constitutes a variable interest entity, which is not consolidated into the Company as there is a separate managing member who controls and operates the entity.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;text-indent:0pt;margin:0pt 0pt 12pt 0pt;">Investments in solar energy programs are accounted for under the proportional amortization method of accounting, rather than consolidation, due to the nature of the investee’s business (solar project where control remains with the managing LLC member) and the relative insignificance to the Company’s consolidated financial statements and constitute unconsolidated variable interest entities.</p>
CY2022Q4	us-gaap	Allowance For Doubtful Other Receivables Current AllowanceForDoubtfulOtherReceivablesCurrent	0
CY2023Q4	us-gaap	Allowance For Doubtful Other Receivables Current AllowanceForDoubtfulOtherReceivablesCurrent	0
CY2023	us-gaap	Investment Banking Revenue InvestmentBankingRevenue	7817000
CY2022	us-gaap	Investment Banking Revenue InvestmentBankingRevenue	5138000
CY2023	us-gaap	Advertising Expense AdvertisingExpense	2700000
CY2022	us-gaap	Advertising Expense AdvertisingExpense	2300000
CY2023	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;text-indent:0pt;margin:0pt;"><b style="font-weight:bold;">Reclassifications – </b>Certain prior period balances in the audited consolidated financial statements may have been reclassified to conform to the current year presentation. These reclassifications had no effect on prior year net income or shareholders’ equity.</p>
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	204269000
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	37000
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	14841000
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	189465000
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	264024000
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	46000
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	18590000
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	245480000
CY2022	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0
CY2023	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0
CY2023Q4	us-gaap	Debt Securities Available For Sale Accumulated Gross Unrealized Gain Loss Before Tax DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax	14804000
CY2022Q4	us-gaap	Debt Securities Available For Sale Accumulated Gross Unrealized Gain Loss Before Tax DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax	18544000
CY2023Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	3876000
CY2022Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	4805000
CY2023Q4	nbbk	Debt Securities Available For Sale Accumulated Gross Unrealized Gain Loss After Tax DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossAfterTax	10928000
CY2022Q4	nbbk	Debt Securities Available For Sale Accumulated Gross Unrealized Gain Loss After Tax DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossAfterTax	13739000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	57476000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	56824000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	95163000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	88905000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	35489000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	29888000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	188128000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	175617000
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	204269000
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	189465000
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	84
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	1411000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	16569000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	13431000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	155633000
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	14842000
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	172202000
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	99
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	5078000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	79284000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	13512000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	151803000
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	18590000
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	231087000
CY2023Q4	nbbk	Depositors Insurance Fund DepositorsInsuranceFund	139000
CY2023Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	14600000
CY2022Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	13200000
CY2023	nbbk	Percentage Of Shares To Be Maintained In Federal Reserve Bank PercentageOfSharesToBeMaintainedInFederalReserveBank	0.50
CY2023	nbbk	Federal Reserve Bank Stock Shares Par Value FederalReserveBankStockSharesParValue	100
CY2023	nbbk	Federal Reserve Bank Stock Shares Par Value To Be Paid At Purchase FederalReserveBankStockSharesParValueToBePaidAtPurchase	50
CY2023	nbbk	Federal Reserve Bank Stock Dividend Rate FederalReserveBankStockDividendRate	0.06
CY2023Q4	nbbk	Federal Reserve Bank Stock Dividend Per Share FederalReserveBankStockDividendPerShare	1.50
CY2023	nbbk	Federal Reserve Stock Holdings Requirement Percentage Change FederalReserveStockHoldingsRequirementPercentageChange	0.15
CY2023Q4	nbbk	Federal Reserve Stock Holdings Requirement Change Share FederalReserveStockHoldingsRequirementChangeShare	100
CY2023Q4	nbbk	Federal Reserve Bank Stock Shares FederalReserveBankStockShares	195936
CY2023Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	10300000
CY2022Q4	nbbk	Federal Reserve Bank Stock Shares FederalReserveBankStockShares	162072
CY2022Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	8100000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss Fee And Loan In Process FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess	3894209000
CY2022Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	3015956000
CY2023Q4	us-gaap	Financing Receivable Unamortized Loan Fee Cost FinancingReceivableUnamortizedLoanFeeCost	-4930000
CY2022Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	511000
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	32222000
CY2022Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	25028000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	3857057000
CY2022Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	2990417000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual FinancingReceivableExcludingAccruedInterestNonaccrual	10798000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss Fee And Loan In Process FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess	3894209000
CY2022Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	3015956000
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	13022000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual No Allowance FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance	7036000
CY2023Q4	nbbk	Financing Receivable Excluding Accrued Interest Nonaccrual With Related Allowance FinancingReceivableExcludingAccruedInterestNonaccrualWithRelatedAllowance	3762000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual FinancingReceivableExcludingAccruedInterestNonaccrual	10798000
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	13022000
CY2023	nbbk	Reversal Amount Of Interest Income For Loans On Non Accrual ReversalAmountOfInterestIncomeForLoansOnNonAccrual	37000
CY2023	nbbk	Financing Receivable Non Accrual Loans Percentage Excluded From Individually Evaluated Loans FinancingReceivableNonAccrualLoansPercentageExcludedFromIndividuallyEvaluatedLoans	0.75
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear	793786000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear	1171431000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear	565913000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear	291477000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear	251400000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear	390104000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Revolving FinancingReceivableExcludingAccruedInterestRevolving	430098000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss Fee And Loan In Process FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess	3894209000
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff	42000
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff	1524000
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff	1163000
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff	311000
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff	789000
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff	709000
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Revolving Writeoff FinancingReceivableExcludingAccruedInterestRevolvingWriteoff	7000
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	4545000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	25028000
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	9657000
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	4545000
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	923000
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	32222000
CY2023Q4	nbbk	Financing Receivable Excluding Accrued Interest Collateral Dependent Loan Amount FinancingReceivableExcludingAccruedInterestCollateralDependentLoanAmount	9430000
CY2023Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	6000000.0
CY2022Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	0
CY2023	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	4228000
CY2023Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	6014000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	5420000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	19608000
CY2022Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	25028000
CY2022Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	14380000
CY2022Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	3001576000
CY2022Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	3015956000
CY2022Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	5711000
CY2022Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	14479000
CY2022Q4	nbbk	Impaired Financing Receivable With No Related Allowance Net Impaired Balance ImpairedFinancingReceivableWithNoRelatedAllowanceNetImpairedBalance	5711000
CY2022Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	8669000
CY2022Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	8669000
CY2022Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	5420000
CY2022Q4	nbbk	Impaired Financing Receivable With Related Allowance Net Impaired Balance ImpairedFinancingReceivableWithRelatedAllowanceNetImpairedBalance	3249000
CY2022Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	14380000
CY2022Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	23148000
CY2022Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	5420000
CY2022Q4	nbbk	Impaired Financing Receivable Net Impaired Balance ImpairedFinancingReceivableNetImpairedBalance	8960000
CY2022	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	13874000
CY2022	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	683000
CY2022	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	367000
CY2022Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	12066000
CY2022	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	0
CY2022	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0
CY2021Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	18415000
CY2022	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	6700000
CY2022	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	322000
CY2022	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	235000
CY2022Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	25028000
CY2022Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	3015956000
CY2023Q4	nbbk	Mortgage Servicing Rights Aggregate Outstanding Unpaid Principal Balance MortgageServicingRightsAggregateOutstandingUnpaidPrincipalBalance	215700000
CY2022Q4	nbbk	Mortgage Servicing Rights Aggregate Outstanding Unpaid Principal Balance MortgageServicingRightsAggregateOutstandingUnpaidPrincipalBalance	231400000
CY2023	nbbk	Gains On Loans Sold Including Recognition Of Mortgage Servicing Rights GainsOnLoansSoldIncludingRecognitionOfMortgageServicingRights	29000000
CY2022	nbbk	Gains On Loans Sold Including Recognition Of Mortgage Servicing Rights GainsOnLoansSoldIncludingRecognitionOfMortgageServicingRights	60000000
CY2022Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	2298000
CY2021Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	2735000
CY2023	nbbk	Servicing Asset At Fair Value Servicing Obligations That Result From Transfers Of Financial Assets ServicingAssetAtFairValueServicingObligationsThatResultFromTransfersOfFinancialAssets	25000
CY2022	nbbk	Servicing Asset At Fair Value Servicing Obligations That Result From Transfers Of Financial Assets ServicingAssetAtFairValueServicingObligationsThatResultFromTransfersOfFinancialAssets	14000
CY2023	us-gaap	Amortization Of Mortgage Servicing Rights Ms Rs AmortizationOfMortgageServicingRightsMSRs	273000
CY2022	us-gaap	Amortization Of Mortgage Servicing Rights Ms Rs AmortizationOfMortgageServicingRightsMSRs	451000
CY2023Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	2050000
CY2022Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	2298000
CY2023	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	0
CY2023Q4	us-gaap	Deposits Deposits	3387348000
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	62064000
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	59214000
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	26533000
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	23870000
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	35531000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	35344000
CY2023	us-gaap	Depreciation Depreciation	2700000
CY2022	us-gaap	Depreciation Depreciation	2400000
CY2023	nbbk	Number Of Building And Land Lease Agreements NumberOfBuildingAndLandLeaseAgreements	7
CY2023	us-gaap	Lessee Operating Lease Existence Of Option To Extend LesseeOperatingLeaseExistenceOfOptionToExtend	true
CY2023Q4	nbbk	Operating Lease Right Of Use Asset Before Accumulated Amortization OperatingLeaseRightOfUseAssetBeforeAccumulatedAmortization	11540000
CY2022Q4	nbbk	Operating Lease Right Of Use Asset Before Accumulated Amortization OperatingLeaseRightOfUseAssetBeforeAccumulatedAmortization	11540000
CY2023Q4	nbbk	Operating Lease Right Of Use Asset Accumulated Amortization OperatingLeaseRightOfUseAssetAccumulatedAmortization	-992000
CY2022Q4	nbbk	Operating Lease Right Of Use Asset Accumulated Amortization OperatingLeaseRightOfUseAssetAccumulatedAmortization	-563000
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	10548000
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	10977000
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	10773000
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	11049000
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P19Y
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P20Y
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0438
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0438
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	765000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	787000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	808000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	825000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	835000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	12846000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	16866000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	6093000
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	10773000
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	938000
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	630000
CY2023Q4	us-gaap	Demand Deposit Accounts DemandDepositAccounts	528409000
CY2022Q4	us-gaap	Demand Deposit Accounts DemandDepositAccounts	445518000
CY2023Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	127640000
CY2022Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	163257000
CY2023Q4	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	345753000
CY2022Q4	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	408894000
CY2023Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	888511000
CY2022Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	659455000
CY2023Q4	nbbk	Total Transactional Accounts TotalTransactionalAccounts	1890313000
CY2022Q4	nbbk	Total Transactional Accounts TotalTransactionalAccounts	1677124000
CY2023Q4	nbbk	Time Deposits Below Fdic Insurance Limit TimeDepositsBelowFdicInsuranceLimit	544246000
CY2022Q4	nbbk	Time Deposits Below Fdic Insurance Limit TimeDepositsBelowFdicInsuranceLimit	415860000
CY2023Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	952789000
CY2022Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	793759000
CY2023Q4	us-gaap	Time Deposits TimeDeposits	1497035000
CY2022Q4	us-gaap	Time Deposits TimeDeposits	1209619000
CY2023	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	2000000.0
CY2022	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	1900000
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate After Five Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAfterFiveYearsFromBalanceSheetDate	0.0427
CY2023	us-gaap	Interest Expense Debt InterestExpenseDebt	14100000
CY2022	us-gaap	Interest Expense Debt InterestExpenseDebt	2900000
CY2022Q4	us-gaap	Deposits Deposits	2886743000
CY2023Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	1472067000
CY2022Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	1022891000
CY2023Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	13360000
CY2022Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	160545000
CY2023Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	3434000
CY2022Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	11137000
CY2023Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	6159000
CY2022Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	5937000
CY2023Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	2015000
CY2022Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	9109000
CY2023Q4	us-gaap	Time Deposits TimeDeposits	1497035000
CY2022Q4	us-gaap	Time Deposits TimeDeposits	1209619000
CY2023Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	183600000
CY2022Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	250000000.0
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary By Interest Rate Type Floating Rate Under One Year FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFloatingRateUnderOneYear	282503000
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Of Amounts Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate	0.0553
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary By Interest Rate Type Floating Rate Under One Year FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFloatingRateUnderOneYear	293075000
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Of Amounts Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate	0.0427
CY2022Q4	nbbk	Federal Home Loan Bank Advance Maturity Floating Rate After Year One Through Two FederalHomeLoanBankAdvanceMaturityFloatingRateAfterYearOneThroughTwo	7000
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate One To Two Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate	0.0280
CY2023Q4	nbbk	Federal Home Loan Bank Advance Maturity Floating Rate After Year Four Through Five FederalHomeLoanBankAdvanceMaturityFloatingRateAfterYearFourThroughFive	560000
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Four To Five Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFourToFiveYearsFromBalanceSheetDate	0.0000
CY2023Q4	nbbk	Federal Home Loan Bank Advance Maturity Floating Rate After Year Five Through Ten FederalHomeLoanBankAdvanceMaturityFloatingRateAfterYearFiveThroughTen	275000
CY2023Q4	nbbk	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Five To Ten Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFiveToTenYearsFromBalanceSheetDate	0.0000
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary By Interest Rate Type Floating Rate FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFloatingRate	283063000
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate After Five Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAfterFiveYearsFromBalanceSheetDate	0.0553
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary By Interest Rate Type Floating Rate FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFloatingRate	293082000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2019000
CY2023Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	5744000
CY2022Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	4998000
CY2023Q4	nbbk	Accrued Retirement Liabilities Or Assets AccruedRetirementLiabilitiesOrAssets	-5744000
CY2022Q4	nbbk	Accrued Retirement Liabilities Or Assets AccruedRetirementLiabilitiesOrAssets	4998000
CY2023Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-1347000
CY2022Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-1241000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6323000
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	5216000
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	3625000
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4523000
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3951000
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	9739000
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	7576000
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-5704000
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-458000
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-2016000
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-795000
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-7720000
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1253000
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2023	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.068
CY2022	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.069
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.007
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.009
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	0.3110
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.398
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.101
CY2023	nbbk	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Percent EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsurancePercent	0.036
CY2022	nbbk	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Percent EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsurancePercent	0.009
CY2023	nbbk	Effective Income Tax Rate Reconciliation Bargain Purchase Gain Percent EffectiveIncomeTaxRateReconciliationBargainPurchaseGainPercent	0.000
CY2022	nbbk	Effective Income Tax Rate Reconciliation Bargain Purchase Gain Percent EffectiveIncomeTaxRateReconciliationBargainPurchaseGainPercent	-0.009
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.023
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.023
CY2023	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.171
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.174
CY2023	us-gaap	Investment Tax Credit InvestmentTaxCredit	5100000
CY2023	us-gaap	Other Noncash Income Tax Expense OtherNoncashIncomeTaxExpense	1400000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	9058000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	7035000
CY2023Q4	nbbk	Deferred Tax Assets Reserve For Off Balance Sheet Commitments DeferredTaxAssetsReserveForOffBalanceSheetCommitments	1691000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Impairment Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses	478000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Impairment Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses	491000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	1236000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	1056000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	1760000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	1963000
CY2023Q4	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	5363000
CY2023Q4	nbbk	Deferred Tax Assets Non Accrual Interest On Loans DeferredTaxAssetsNonAccrualInterestOnLoans	205000
CY2022Q4	nbbk	Deferred Tax Assets Non Accrual Interest On Loans DeferredTaxAssetsNonAccrualInterestOnLoans	184000
CY2023Q4	us-gaap	Deferred Tax Assets Other Comprehensive Loss DeferredTaxAssetsOtherComprehensiveLoss	377000
CY2022Q4	us-gaap	Deferred Tax Assets Other Comprehensive Loss DeferredTaxAssetsOtherComprehensiveLoss	348000
CY2023Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	3876000
CY2022Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	4805000
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	55000
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	29000
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	24099000
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	15911000
CY2023Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	576000
CY2022Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	646000
CY2023Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1752000
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1777000
CY2022Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	90000
CY2023Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	2300000
CY2022Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	1623000
CY2023Q4	nbbk	Deferred Tax Liabilities Bargain Purchase Gain DeferredTaxLiabilitiesBargainPurchaseGain	345000
CY2022Q4	nbbk	Deferred Tax Liabilities Bargain Purchase Gain DeferredTaxLiabilitiesBargainPurchaseGain	387000
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	4973000
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	4523000
CY2023Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	19126000
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	11388000
CY2023Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0
CY2023Q4	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability Bad Debt Reserve For Tax Purposes Of Qualified Lender DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityBadDebtReserveForTaxPurposesOfQualifiedLender	13806000
CY2023Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.136
CY2022Q4	us-gaap	Capital Capital	382417000
CY2022Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.060
CY2022Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.113
CY2022Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	271323000
CY2022Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.080
CY2022Q4	us-gaap	Capital Required To Be Well Capitalized CapitalRequiredToBeWellCapitalized	339153000
CY2022Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.100
CY2022Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	357389000
CY2022Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.105
CY2022Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	203492000
CY2022Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized TierOneRiskBasedCapitalRequiredToBeWellCapitalized	271323000
CY2022Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.080
CY2022Q4	us-gaap	Common Equity Tier One Capital CommonEquityTierOneCapital	357389000
CY2022Q4	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.105
CY2022Q4	us-gaap	Common Equity Tier One Capital Required For Capital Adequacy CommonEquityTierOneCapitalRequiredForCapitalAdequacy	152619000
CY2022Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Capital Adequacy Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum	0.045
CY2022Q4	us-gaap	Common Equity Tier One Capital Required To Be Well Capitalized CommonEquityTierOneCapitalRequiredToBeWellCapitalized	220450000
CY2022Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Well Capitalized Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum	0.065
CY2022Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	357389000
CY2022Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.105
CY2022Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	136311000
CY2022Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.040
CY2022Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized TierOneLeverageCapitalRequiredToBeWellCapitalized	170389000
CY2022Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.050
CY2023	us-gaap	Concentration Risk Credit Risk Uninsured Deposits ConcentrationRiskCreditRiskUninsuredDeposits	no
CY2023Q4	nbbk	Amount Of Uninsured Investments AmountOfUninsuredInvestments	182100000
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	189500000
CY2023Q4	us-gaap	Principal Amount Outstanding Of Loans Held In Portfolio PrincipalAmountOutstandingOfLoansHeldInPortfolio	3890000000
CY2023Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	50500000
CY2023Q4	nbbk	Policies Maintained With Number Of Reputable And Sound Life Insurance Companies PoliciesMaintainedWithNumberOfReputableAndSoundLifeInsuranceCompanies	4
CY2023Q4	nbbk	Amount Of Deposit Obligations With Customers In Cannabis Industry AmountOfDepositObligationsWithCustomersInCannabisIndustry	316000000.0
CY2023Q4	nbbk	Percentage Of Total Deposits Obligations With Customers In Cannabis Industry PercentageOfTotalDepositsObligationsWithCustomersInCannabisIndustry	0.0933
CY2023Q4	nbbk	Amount Of Borrowings With Federal Home Loan Bank AmountOfBorrowingsWithFederalHomeLoanBank	283300000
CY2023Q4	nbbk	Borrowings With Federal Home Loan Bank On Percentage Of Total Liabilities BorrowingsWithFederalHomeLoanBankOnPercentageOfTotalLiabilities	0.0750
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	3000000.0
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	0
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	0
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	0
CY2023Q4	nbbk	Number Of Last Of Layer Hedges Previously Entered NumberOfLastOfLayerHedgesPreviouslyEntered	2
CY2021Q3	nbbk	Payments For Termination Of Hedge PaymentsForTerminationOfHedge	2150000
CY2023Q4	nbbk	Unamortized Amount Of Cost Basis Adjustment For Termination Of Layer Hedges UnamortizedAmountOfCostBasisAdjustmentForTerminationOfLayerHedges	1000000.0
CY2022Q4	nbbk	Unamortized Amount Of Cost Basis Adjustment For Termination Of Layer Hedges UnamortizedAmountOfCostBasisAdjustmentForTerminationOfLayerHedges	1200000
CY2023	nbbk	Swap Contract Fees Net Of Brokerage Costs SwapContractFeesNetOfBrokerageCosts	2200000
CY2022	nbbk	Swap Contract Fees Net Of Brokerage Costs SwapContractFeesNetOfBrokerageCosts	1300000
CY2023Q4	nbbk	Collateral Deposit Accounts Require To Maintain To Mitigate Counterparty Default Risk CollateralDepositAccountsRequireToMaintainToMitigateCounterpartyDefaultRisk	9100000
CY2022Q4	nbbk	Collateral Deposit Accounts Require To Maintain To Mitigate Counterparty Default Risk CollateralDepositAccountsRequireToMaintainToMitigateCounterpartyDefaultRisk	8600000
CY2023	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	3313000
CY2023	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	809000
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2504000
CY2022	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-16309000
CY2022	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-4180000
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-12129000
CY2022Q4	us-gaap	Other Liabilities OtherLiabilities	2245000
CY2021Q4	us-gaap	Other Liabilities OtherLiabilities	2683000
CY2023	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	3150000
CY2023	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	2002000
CY2022	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	438000
CY2023Q4	us-gaap	Other Liabilities OtherLiabilities	3393000
CY2022Q4	us-gaap	Other Liabilities OtherLiabilities	2245000
CY2023Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	1600000
CY2022Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	3000000.0
CY2023	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	0
CY2023	us-gaap	Net Income Loss NetIncomeLoss	9825000
CY2023	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	42705729
CY2023	us-gaap	Weighted Average Number Of Shares Employee Stock Ownership Plan Shares Not Committed To Be Released WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased	687500
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	42018229
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	42018229
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2023Q4	nbbk	Claimed Refund From Employee Retention Tax Credits ClaimedRefundFromEmployeeRetentionTaxCredits	3500000
CY2023	nbbk	Period For Audit Of Employee Retention Tax Credits Claims PeriodForAuditOfEmployeeRetentionTaxCreditsClaims	P3Y
CY2023	nbbk	Extended Period For Audit Of Employee Retention Tax Credits Claims ExtendedPeriodForAuditOfEmployeeRetentionTaxCreditsClaims	P5Y
CY2023Q4	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
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CY2023Q4	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false

Files In Submission

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2024 Q1 Form 10-K Financial Statement

#000155837024004193 Filed on March 28, 2024

Income Statement

Balance Sheet

Cashflow Statement

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$NBBK NB Bancorp, Inc. Stock $nbbk

2024 Q1 Form 10-K Financial Statement

#000155837024004193 Filed on March 28, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NBBK
NB Bancorp, Inc. Stock $nbbk