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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Effect of cash flow hedging and fair value (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Loans        
Derivative Instruments, Gain (Loss) [Line Items]        
Income and expense line items presented in the consolidated statements of income $ 48,426 $ 42,042 $ 132,956 $ 122,146
Securities and other        
Derivative Instruments, Gain (Loss) [Line Items]        
Income and expense line items presented in the consolidated statements of income 6,355 6,538 17,112 19,095
Deposits        
Derivative Instruments, Gain (Loss) [Line Items]        
Income and expense line items presented in the consolidated statements of income 16,419 16,174 47,442 45,486
Borrowings        
Derivative Instruments, Gain (Loss) [Line Items]        
Income and expense line items presented in the consolidated statements of income 2,544 3,448 8,845 10,983
Non-interest Income        
Derivative Instruments, Gain (Loss) [Line Items]        
Income and expense line items presented in the consolidated statements of income 10,567 9,653 24,131 27,496
Interest rate swap on wholesale funding | Cash flow hedges | Borrowings        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) on cash flow hedges:   828 269 2,483
Interest rate swap on variable rate loans | Cash flow hedges | Loans        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) on cash flow hedges: (466) (588) (1,380) (1,758)
Interest rate swap on securities | Fair Value Hedging | Securities and other        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) on fair value hedges: $ 281 $ 372 $ 834 $ 1,113