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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Identifiable Intangible Assets    
Gross Carrying Amount $ 213,206 $ 203,292
Accumulated Amortization (164,960) (150,701)
Net Carrying Amount 48,246 52,591
Estimated aggregate amortization expense for each of five succeeding fiscal years    
2025 12,733  
2026 11,191  
2027 5,370  
2028 4,061  
2029 3,366  
Thereafter 11,525  
Net Carrying Amount 48,246 52,591
Components of goodwill    
Goodwill, beginning of period 845,396 841,841
Goodwill, Additions/Adjustments 7,829 3,555
Goodwill, end of period 853,225 845,396
Total principal balance of loans 538,100 532,900
Total custodial escrow balances maintained in connection with loans 10,500 10,200
Core deposit intangibles    
Identifiable Intangible Assets    
Gross Carrying Amount 77,373 77,373
Accumulated Amortization (72,225) (69,214)
Net Carrying Amount 5,148 8,159
Estimated aggregate amortization expense for each of five succeeding fiscal years    
Net Carrying Amount 5,148 8,159
Other intangibles    
Identifiable Intangible Assets    
Gross Carrying Amount 135,833 125,919
Accumulated Amortization (92,735) (81,487)
Net Carrying Amount 43,098 44,432
Estimated aggregate amortization expense for each of five succeeding fiscal years    
Net Carrying Amount $ 43,098 $ 44,432