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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Included In The Consolidated Statements Of Income Related To Interest Rate Swap Agreements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative [Line Items]      
Gain (loss) included in interest expense on deposits $ 108,157 $ 29,075 $ 9,404
Gain (loss) included in interest expense on FHLB borrowings 6,777 3,291 7,348
Gain (loss) included in interest expense on other borrowings 21,356 1,862 42
Total interest expense 144,714 40,640 26,430
Gain (loss) included in interest income on tax-exempt investment securities 54,629 45,001 37,730
Other noninterest income 5,654 6,328 5,505
Interest Rate Swaps | Derivatives designated as hedging instruments | Fair Value Hedging      
Derivative [Line Items]      
Gain (loss) included in interest income on tax-exempt investment securities 12,834 422 0
Interest Rate Swaps | Derivatives designated as hedging instruments | Cash Flow Hedging      
Derivative [Line Items]      
Gain (loss) included in interest expense on deposits 15,225 2,917 (103)
Gain (loss) included in interest expense on FHLB borrowings 8,432 721  
Gain (loss) included in interest expense on FHLB borrowings     6,292
Gain (loss) included in interest expense on other borrowings 887 0 0
Total interest expense 24,544 3,638 (6,395)
Interest Rate Swaps | Derivatives designated as non-hedging instruments      
Derivative [Line Items]      
Other noninterest income $ 352 $ 472 $ 813