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
Mar. 31, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]    
Total undisbursed loan commitments $ 416,982 $ 413,792
Commitments to extend credit    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments 375,233 371,287
Standby letters of credit    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments 32,108 31,372
Commercial letters of credit    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments $ 9,642 $ 11,133