Annual report pursuant to Section 13 and 15(d)

Off-Balance Sheet Commitments - Distribution of Undisbursed Loan Commitments (Detail)

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Off-Balance Sheet Commitments - Distribution of Undisbursed Loan Commitments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]    
Total undisbursed loan commitments $ 273,537 $ 325,612
Commitments to extend credit [Member]    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments 262,680 309,584
Standby letters of credit [Member]    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments 6,839 8,982
Commercial letters of credit [Member]    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments $ 4,018 $ 7,046