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ALLOWANCE FOR CREDIT LOSSES ON LOANS AND FINANCE LOSSES - Activity in ACL for unfunded loan commitments and standby letters of credit (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2020
Jan. 01, 2019
Jan. 01, 2018
Financing Receivable Allowance For Credit Losses [Line Items]            
Beginning balance $ 0 $ 412 $ 676      
Provision (release) for credit losses 1,183 (412) (264)      
Ending balance $ 5,105 $ 0 $ 412      
ASC 326 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Impact of adopting ASC 326       $ 3,922 $ 0 $ 0