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SECURITIES (Securities Debt Maturities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Available-for-sale Securities, Amortized Cost, Maturing in one year or less $ 6,144  
Available-for-sale Securities, Amortized Cost, Maturing after one year through five years 124,382  
Available-for-sale Securities, Amortized Cost, Maturing after five years through ten years 437,813  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 1,955,629  
Debt Securities, Available-for-sale, Amortized Cost 2,523,968 $ 2,729,980
Available-for-sale Securities, Fair Value, Maturing in one year or less 6,059  
Available-for-sale Securities, Fair Value, Maturing after one year through five years 120,485  
Available-for-sale Securities, Fair Value, Maturing after five years through ten years 405,679  
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 1,705,716  
Debt Securities, Available-for-sale 2,237,939 2,373,783
Held-to-maturity Securities, Amortized Cost, Maturing in one year or less 5,511  
Held-to-maturity Securities, Amortized Cost, Maturing after one year through five years 15,271  
Held-to-maturity Securities, Amortized Cost, Maturing after five years through ten years 29,559  
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 963,869  
Held-to-maturity Securities, Amortized Cost 1,014,210 1,059,387
Held-to-maturity Securities, Fair Value, Maturing in one year or less 5,310  
Held-to-maturity Securities, Fair Value, Maturing after one year through five years 15,186  
Held-to-maturity Securities, Fair Value, Maturing after five years through ten years 28,651  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 830,131  
Debt Securities, Held-to-maturity, Fair Value $ 879,278 $ 907,514