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, 2016
Dec. 31, 2015
Loss Contingencies [Line Items]    
Total undisbursed loan commitments $ 330,871 $ 273,537
Commitments to extend credit [Member]    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments 310,987 262,680
Standby letters of credit [Member]    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments 15,669 6,839
Commercial letters of credit [Member]    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments $ 4,215 $ 4,018