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Other Borrowed Funds and Subordinated Debentures - Summary of Other Borrowed Funds and Subordinated Debentures (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]      
Amount outstanding at December 31 $ 431,583cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearAmountOutstanding $ 291,227cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearAmountOutstanding $ 231,227cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearAmountOutstanding
Weighted average rate at December 31 1.91%cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearWeightedAverageInterestRateAtPeriodEnd 3.04%cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearWeightedAverageInterestRateAtPeriodEnd 3.54%cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearWeightedAverageInterestRateAtPeriodEnd
Maximum amount outstanding at any month end 431,583cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearMaximumOutstandingAtAnyMonthEnd 291,227cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearMaximumOutstandingAtAnyMonthEnd 277,226cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearMaximumOutstandingAtAnyMonthEnd
Daily average balance outstanding during the year $ 271,710cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearDailyAverageOutstandingBalance $ 231,032cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearDailyAverageOutstandingBalance $ 217,542cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearDailyAverageOutstandingBalance
Weighted average rate during the year 3.34%cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearWeightedAverageInterestRateForYear 3.73%cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearWeightedAverageInterestRateForYear 3.82%cnbka_OtherBorrowedFundsAndSubordinatedDebenturesActivityForYearWeightedAverageInterestRateForYear