Quarterly report pursuant to Section 13 or 15(d)

Off-Balance Sheet Commitments - Allowance for Credit Losses Related to Off-Balance Sheet Items (Detail)

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Off-Balance Sheet Commitments - Allowance for Credit Losses Related to Off-Balance Sheet Items (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Loss Contingencies [Line Items]    
Balance at beginning of period $ 2,792 $ 2,397
Adjusted balance 2,792 2,062
Provision expense (income) for credit losses (450) 823
Balance at end of period $ 2,342 2,885
ASU 2016-13    
Loss Contingencies [Line Items]    
Adjustment related to adoption of ASU 2016-13   $ (335)