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SECURITIES (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
AFS Securities [Abstract] |  |
Due in one year or less, Amortized Cost | $ 56,948 | $ 42,447
Due in one year or less, Estimated Fair Value | 56,120 | 41,735
Due after one year through five years, Amortized Cost | 138,070 | 158,063
Due after one year through five years, Estimated Fair Value | 135,530 | 152,523
Due after five years through ten years, Amortized Cost | 262,259 | 343,303
Due after five years through ten years, Estimated Fair Value | 236,096 | 312,935
Due after ten years, Amortized Cost | 2,150,751 | 2,660,548
Due after ten years, Estimated Fair Value | 1,657,182 | 2,234,623
Total AFS securities | 2,608,028 | 3,204,361
Total AFS securities, Estimated Fair Value | 2,084,928 | 2,741,816
HTM Securities [Abstract] |  |
Due in one year or less, Carrying Value | 2,759 | 2,010
Due in one year or less, Estimated Fair Value | 2,735 | 2,006
Due after one year through five years, Carrying Value | 36,604 | 35,044
Due after one year through five years, Estimated Fair Value | 36,272 | 35,014
Due after five years through ten years, Carrying Value | 43,652 | 19,941
Due after five years through ten years, Estimated Fair Value | 41,057 | 20,239
Due after ten years, Carrying Value | 760,254 | 790,737
Due after ten years, Estimated Fair Value | 681,982 | 744,628
Total HTM Securities | 843,269 | 847,732
Total HTM securities, Estimated Fair Value | $ 762,046 | $ 801,887

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