Quarterly report pursuant to Section 13 or 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
Jun. 30, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]    
Total undisbursed loan commitments $ 280,773 $ 325,612
Commitments to extend credit [Member]    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments 270,702 309,584
Standby letters of credit [Member]    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments 5,426 8,982
Commercial letters of credit [Member]    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments $ 4,645 $ 7,046