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Income Taxes - Income Tax Accounts Included in Other Assets/Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Currently receivable	$ 707us-gaap_IncomeTaxesReceivable	$ 702us-gaap_IncomeTaxesReceivable
Deferred income tax asset, net	37,251us-gaap_DeferredTaxAssetsLiabilitiesNet	30,857us-gaap_DeferredTaxAssetsLiabilitiesNet
Total	$ 37,958cnbka_AggregateIncomeTaxReceivable	$ 31,559cnbka_AggregateIncomeTaxReceivable

Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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