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LOANS AND CREDIT QUALITY - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
ACL for LHFI        
Beginning balance $ 41,500 $ 37,355 $ 41,500 $ 47,123
Provision for credit losses (990) 249 (290) (9,190)
Net (charge-offs) recoveries (510) 2 (1,210) (327)
Ending balance 40,000 37,606 40,000 37,606
Allowance for unfunded commitments:        
Beginning balance 1,721 2,843 2,197 2,404
Provision for credit losses (120) (249) (596) 190
Ending balance 1,601 2,594 1,601 2,594
Provision for credit losses:        
Allowance for credit losses - loans (990) 249 (290) (9,190)
Allowance for unfunded commitments (120) (249) (596) 190
Total $ (1,110) $ 0 $ (886) $ (9,000)