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Commitments and Contingent Liabilities - Notional Amount of Outstanding Commitments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Commitments to extend credit [Member]    
Loss Contingencies [Line Items]    
Financial instrument of credit risk $ 1,616,286 $ 1,643,187
Financial standby letters of credit [Member]    
Loss Contingencies [Line Items]    
Financial instrument of credit risk 19,256 17,843
Performance standby letters of credit [Member]    
Loss Contingencies [Line Items]    
Financial instrument of credit risk 28,067 26,497
Commercial letters of credit [Member]    
Loss Contingencies [Line Items]    
Financial instrument of credit risk $ 1,615 $ 1,672