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SECURITIES (Securities Debt Maturities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Trading Securities, Amortized Cost, Maturing in one year or less $ 0  
Trading Securities, Amortized Cost, Maturing after one year through five years 0  
Trading Securities, Amortized Cost, Maturing after five years through ten years 0  
Trading Securities, Amortized Cost, Maturing after ten years through twenty years 27,203  
Trading Securities, Amortized Cost, Maturing after twenty years 0  
Trading Securities, Amortized Cost 27,203 $ 27,203
Trading Securities, Fair Value, Maturing in one year or less 0  
Trading Securities, Fair Value, Maturing after one year through five years 0  
Trading Securities, Fair Value, Maturing after five years through ten years 0  
Trading Securities, Fair Value, Maturing after ten years through twenty years 25,039  
Trading Securities, Fair Value, Maturing after twenty years 0  
Trading Securities, Fair Value 25,039 24,980
Available-for-sale Securities, Amortized Cost, Maturing in one year or less 158,605  
Available-for-sale Securities, Amortized Cost, Maturing after one year through five years 178,983  
Available-for-sale Securities, Amortized Cost, Maturing after five years through ten years 680,138  
Available-for-sale Securities, Amortized Cost, Maturing after ten years through twenty years 276,682  
Available-for-sale Securities, Amortized Cost, Maturing after twenty years 1,702,494  
Available-for-sale Securities, Amortized Cost 2,996,902 2,256,189
Available-for-sale Securities, Fair Value, Maturing in one year or less 158,816  
Available-for-sale Securities, Fair Value, Maturing after one year through five years 187,427  
Available-for-sale Securities, Fair Value, Maturing after five years through ten years 675,201  
Available-for-sale Securities, Fair Value, Maturing after ten years through twenty years 285,450  
Available-for-sale Securities, Fair Value, Maturing after twenty years 1,682,866  
Available-for-sale Securities, Fair Value 2,989,760 2,322,593
Held-to-maturity Securities, Amortized Cost, Maturing in one year or less 5,609  
Held-to-maturity Securities, Amortized Cost, Maturing after one year through five years 54,888  
Held-to-maturity Securities, Amortized Cost, Maturing after five years through ten years 33,435  
Held-to-maturity Securities, Amortized Cost, Maturing after ten years through twenty years 152,353  
Held-to-maturity Securities, Amortized Cost, Maturing after twenty years 195,670  
Held-to-maturity Securities, Amortized Cost 441,955 421,807
Held-to-maturity Securities, Fair Value, Maturing in one year or less 5,671  
Held-to-maturity Securities, Fair Value, Maturing after one year through five years 57,069  
Held-to-maturity Securities, Fair Value, Maturing after five years through ten years 35,387  
Held-to-maturity Securities, Fair Value, Maturing after ten years through twenty years 155,651  
Held-to-maturity Securities, Fair Value, Maturing after twenty years 205,817  
Debt Securities, Held-to-maturity, Fair Value $ 459,595 $ 448,681