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ALLOWANCE FOR CREDIT LOSSES FOR LOANS AND FINANCE LEASES - Activity in ACL for unfunded loan commitments and standby letters of credit (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jul. 01, 2021
Jan. 01, 2021
Jul. 01, 2020
Jan. 01, 2020
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning Balance $ 2,730 $ 7,084 $ 5,105 $ 0        
Provision (release) for credit losses (971) (803) (3,346) 2,359        
Ending balance $ 1,759 $ 6,281 $ 1,759 $ 6,281        
ASC 326 | Cumulative Effect Period Of Adoption Adjustment [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Impact of adopting ASC 326 on unfunded loan commitments and standby letters of credit         $ 0 $ 0 $ 0 $ 3,922