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
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Loss Contingencies [Line Items]          
Total undisbursed loan commitments $ 385,147   $ 385,147   $ 371,448
Allowance for Loan Off-Balance Sheet Items [Roll Forward]          
Balance at beginning of period 1,333 $ 1,357 1,439 $ 1,296  
Provision (income) 209 0 103 61  
Balance at end of period 1,542 $ 1,357 1,542 $ 1,357  
Commitments to extend credit          
Loss Contingencies [Line Items]          
Total undisbursed loan commitments 346,182   346,182   325,100
Standby letters of credit          
Loss Contingencies [Line Items]          
Total undisbursed loan commitments 32,585   32,585   32,500
Commercial letters of credit          
Loss Contingencies [Line Items]          
Total undisbursed loan commitments $ 6,380   $ 6,380   $ 13,848