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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
ASSETS    
Cash and due from banks (Note 2) $ 43,367us-gaap_CashAndDueFromBanks $ 59,956us-gaap_CashAndDueFromBanks
Federal funds sold and interest-bearing deposits in other banks 261,990cnbka_FederalFundsSoldAndInterestBearingDepositsInOtherBanks 34,722cnbka_FederalFundsSoldAndInterestBearingDepositsInOtherBanks
Total cash and cash equivalents 305,357us-gaap_CashCashEquivalentsAndFederalFundsSold 94,678us-gaap_CashCashEquivalentsAndFederalFundsSold
Short-term investments 2,131us-gaap_ShortTermInvestments 4,617us-gaap_ShortTermInvestments
Securities available-for-sale, amortized cost $448,210 in 2014 and $465,943 in 2013 (Notes 3, 9 and 11) 448,390us-gaap_AvailableForSaleSecurities 464,245us-gaap_AvailableForSaleSecurities
Securities held-to-maturity, fair value $1,413,603 in 2014 and $1,464,449 in 2013 (Notes 4 and 11) 1,406,792us-gaap_HeldToMaturitySecurities 1,487,884us-gaap_HeldToMaturitySecurities
Federal Home Loan Bank of Boston, stock at cost 24,916us-gaap_FederalHomeLoanBankStock 18,072us-gaap_FederalHomeLoanBankStock
Loans, net (Note 5) 1,331,366us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 1,264,763us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Less: allowance for loan losses (Note 6) 22,318us-gaap_LoansAndLeasesReceivableAllowance 20,941us-gaap_LoansAndLeasesReceivableAllowance
Net loans 1,309,048us-gaap_LoansAndLeasesReceivableNetReportedAmount 1,243,822us-gaap_LoansAndLeasesReceivableNetReportedAmount
Bank premises and equipment (Note 7) 24,182us-gaap_PropertyPlantAndEquipmentNet 23,400us-gaap_PropertyPlantAndEquipmentNet
Accrued interest receivable 6,241us-gaap_InterestReceivable 6,539us-gaap_InterestReceivable
Prepaid FDIC assessments 0cnbka_PrepaidFdicAssessments 0cnbka_PrepaidFdicAssessments
Other assets (Notes 8 and 16) 96,979us-gaap_OtherAssets 87,897us-gaap_OtherAssets
Total assets 3,624,036us-gaap_Assets 3,431,154us-gaap_Assets
LIABILITIES AND STOCKHOLDERS' EQUITY    
Demand deposits 484,928us-gaap_DemandDepositAccounts 475,862us-gaap_DemandDepositAccounts
Savings and NOW deposits 978,619cnbka_SavingsAndNowDeposits 992,796cnbka_SavingsAndNowDeposits
Money market accounts 890,899us-gaap_DepositsMoneyMarketDeposits 864,957us-gaap_DepositsMoneyMarketDeposits
Time deposits (Note 10) 383,145us-gaap_TimeDeposits 382,224us-gaap_TimeDeposits
Total deposits 2,737,591us-gaap_Deposits 2,715,839us-gaap_Deposits
Securities sold under agreements to repurchase (Note 11) 212,360us-gaap_SecuritiesSoldUnderAgreementsToRepurchase 214,440us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Other borrowed funds (Note 12) 395,500us-gaap_OtherBorrowings 255,144us-gaap_OtherBorrowings
Subordinated debentures (Note 12) 36,083us-gaap_SubordinatedDebt 36,083us-gaap_SubordinatedDebt
Other liabilities 50,002us-gaap_OtherLiabilities 33,176us-gaap_OtherLiabilities
Total liabilities 3,431,536us-gaap_Liabilities 3,254,682us-gaap_Liabilities
Commitments and contingencies (Notes 7, 18 and 19)      
Stockholders' equity (Note 15):    
Preferred Stock - $1.00 par value; 100,000 shares authorized; no shares issued and outstanding      
Additional paid-in capital 12,292us-gaap_AdditionalPaidInCapitalCommonStock 11,932us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 200,411us-gaap_RetainedEarningsAccumulatedDeficit 180,747us-gaap_RetainedEarningsAccumulatedDeficit
Stockholders' equity before adjustment of accumulated other comprehensive income (loss) 218,271cnbka_StockholdersEquityBeforeAdjustmentOfAccumulatedOtherComprehensiveIncomeLossNetOfTaxes 198,235cnbka_StockholdersEquityBeforeAdjustmentOfAccumulatedOtherComprehensiveIncomeLossNetOfTaxes
Unrealized gains (losses) on securities available-for-sale, net of taxes 77us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (1,045)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Unrealized losses on securities transferred to held-to-maturity, net of taxes (10,479)cnbka_AccumulatedOtherComprehensiveIncomeLossUnrealizedLossesOnSecuritiesTransferredToHeldToMaturityNetOfTaxes (13,667)cnbka_AccumulatedOtherComprehensiveIncomeLossUnrealizedLossesOnSecuritiesTransferredToHeldToMaturityNetOfTaxes
Pension liability, net of taxes (15,369)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (7,051)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Total accumulated other comprehensive loss, net of taxes (Notes 3, 13 and 15) (25,771)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (21,763)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 192,500us-gaap_StockholdersEquity 176,472us-gaap_StockholdersEquity
Total liabilities and stockholders' equity 3,624,036us-gaap_LiabilitiesAndStockholdersEquity 3,431,154us-gaap_LiabilitiesAndStockholdersEquity
Class A Common Stock [Member]    
Stockholders' equity (Note 15):    
Common stock value 3,601us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 3,580us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Total stockholders' equity 3,601us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 3,580us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Class B Common Stock [Member]    
Stockholders' equity (Note 15):    
Common stock value 1,967us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 1,976us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Total stockholders' equity $ 1,967us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 1,976us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember