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LOANS AND CREDIT QUALITY - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
ACL for LHFI        
Beginning balance $ 37,355 $ 59,897 $ 47,123 $ 64,294
Provision for credit losses 249 (5,348) (9,190) (9,864)
Net (charge-offs) recoveries 2 (33) (327) 86
Ending balance 37,606 54,516 37,606 54,516
Allowance for unfunded commitments:        
Beginning balance 2,843 2,104 2,404 1,588
Provision for credit losses (249) 348 190 864
Ending balance 2,594 2,452 2,594 2,452
Allowance for credit losses - loans 249 (5,348) (9,190) (9,864)
Total $ 0 $ (5,000) $ (9,000) $ (9,000)