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Deposits - Additional Information (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Banking and Thrift [Abstract]    
Aggregate amount of deposits reclassified as loans $ 463,000us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1 $ 405,000us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1
Deposit liabilities with abnormal terms $ 0us-gaap_DepositLiabilitiesWithAbnormalTerms $ 0us-gaap_DepositLiabilitiesWithAbnormalTerms