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Borrowings - Summary of Repurchase Agreements Accounted for as Secured Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Short-term Debt [Abstract]    
Securities of U.S. Government agencies and mortgage-backed securities of government agencies pledged, fair value $ 48,791 $ 46,842
Repurchase agreements $ 48,598 $ 46,627