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SECURITIES (Securities Debt Maturities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Available-for-sale Securities, Amortized Cost, Maturing in one year or less $ 0  
Available-for-sale Securities, Amortized Cost, Maturing after one year through five years 97,908  
Available-for-sale Securities, Amortized Cost, Maturing after five years through ten years 378,531  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 2,141,547  
Debt Securities, Available-for-sale, Amortized Cost 2,617,986 $ 2,729,980
Available-for-sale Securities, Fair Value, Maturing in one year or less 0  
Available-for-sale Securities, Fair Value, Maturing after one year through five years 92,601  
Available-for-sale Securities, Fair Value, Maturing after five years through ten years 333,217  
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 1,819,121  
Debt Securities, Available-for-sale 2,244,939 2,373,783
Held-to-maturity Securities, Amortized Cost, Maturing in one year or less 3,670  
Held-to-maturity Securities, Amortized Cost, Maturing after one year through five years 18,498  
Held-to-maturity Securities, Amortized Cost, Maturing after five years through ten years 21,005  
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 995,461  
Held-to-maturity Securities, Amortized Cost 1,038,634 1,059,387
Held-to-maturity Securities, Fair Value, Maturing in one year or less 3,461  
Held-to-maturity Securities, Fair Value, Maturing after one year through five years 18,128  
Held-to-maturity Securities, Fair Value, Maturing after five years through ten years 19,880  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 827,628  
Debt Securities, Held-to-maturity, Fair Value $ 869,097 $ 907,514