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Securities Sold Under Repurchase Agreements - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Brokers and Dealers [Abstract]    
Securities sold under repurchase agreements $ 73,310us-gaap_SecuritiesSoldUnderAgreementsToRepurchase $ 83,516us-gaap_SecuritiesSoldUnderAgreementsToRepurchase