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SECURITIES (Securities Debt Maturities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Available-for-sale Securities, Amortized Cost, Maturing in one year or less $ 21,156  
Available-for-sale Securities, Amortized Cost, Maturing after one year through five years 146,075  
Available-for-sale Securities, Amortized Cost, Maturing after five years through ten years 299,674  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 1,825,930  
Debt Securities, Available-for-sale, Amortized Cost 2,292,835 $ 2,460,262
Available-for-sale Securities, Fair Value, Maturing in one year or less 21,014  
Available-for-sale Securities, Fair Value, Maturing after one year through five years 136,704  
Available-for-sale Securities, Fair Value, Maturing after five years through ten years 281,839  
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 1,578,968  
Debt Securities, Available-for-sale 2,018,525 2,104,511
Held-to-maturity Securities, Amortized Cost, Maturing in one year or less 9,418  
Held-to-maturity Securities, Amortized Cost, Maturing after one year through five years 11,494  
Held-to-maturity Securities, Amortized Cost, Maturing after five years through ten years 31,294  
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 919,695  
Held-to-maturity Securities, Amortized Cost 971,901 1,001,861
Held-to-maturity Securities, Fair Value, Maturing in one year or less 9,248  
Held-to-maturity Securities, Fair Value, Maturing after one year through five years 11,315  
Held-to-maturity Securities, Fair Value, Maturing after five years through ten years 29,805  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 765,066  
Debt Securities, Held-to-maturity, Fair Value $ 815,434 $ 825,528