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Commitments and Contingent Liabilities - Summary of Company's Commitments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]    
Commitments to extend credit $ 293,517abcb_CommitmentsToExtendCredit $ 215,995abcb_CommitmentsToExtendCredit
Unused lines of credit 49,567abcb_UnusedLinesOfCredit 41,200abcb_UnusedLinesOfCredit
Financial standby letters of credit 9,683abcb_LetterOfCreditMaximumIssuance 7,665abcb_LetterOfCreditMaximumIssuance
Mortgage interest rate lock commitments $ 38,868abcb_MortgageInterestRateLockCommitments $ 35,035abcb_MortgageInterestRateLockCommitments