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LOANS AND CREDIT QUALITY - Changes in the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ 68,334 $ 108,021 $ 88,558 $ 133,778
Initial allowance on acquired PCD loans 63,494   63,494  
Provision (reversal of provision) for credit losses on loans and leases 46,058 6,730 42,663 2,684
Ending balance 168,959 103,481 168,959 103,481
Unfunded Loan Commitment        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 3,735 4,818 4,366 4,314
Initial allowance on acquired PCD loans 3,736 0 3,736 0
Provision (reversal of provision) for credit losses on loans and leases 960 13 329 517
Ending balance $ 8,431 $ 4,831 $ 8,431 $ 4,831