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Commitments and Contingent Liabilities - Summary of Financial Instruments with Off-Balance-Sheet Risks (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]    
Loan commitments $ 981,777 $ 960,490
Stand-by letters of credit $ 56,551 $ 61,889