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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Unfunded loan commitment allowances activity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Activity in the ACL for unfunded loan commitments        
Balance at the beginning of period $ 51,650 $ 40,534 $ 44,876 $ 34,729
Provision/(credit) for credit losses 777 2,007 5,445 7,807
Total ending allowance balance 52,298 42,541 52,298 42,541
Cumulative Effect, Period of Adoption, Adjustment        
Activity in the ACL for unfunded loan commitments        
Balance at the beginning of period     2,250  
Unfunded loan commitment        
Activity in the ACL for unfunded loan commitments        
Balance at the beginning of period 1,240 180 180 180
Provision/(credit) for credit losses 14 297
Total ending allowance balance $ 1,254 $ 180 1,254 $ 180
Unfunded loan commitment | Cumulative Effect, Period of Adoption, Adjustment        
Activity in the ACL for unfunded loan commitments        
Balance at the beginning of period     $ 777