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SECURITIES (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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AFS Securities [Abstract] |  |
Due in one year or less, Amortized Cost | $ 42,447 | $ 18,247
Due in one year or less, Estimated Fair Value | 41,735 | 18,317
Due after one year through five years, Amortized Cost | 158,063 | 180,080
Due after one year through five years, Estimated Fair Value | 152,523 | 183,981
Due after five years through ten years, Amortized Cost | 343,303 | 324,615
Due after five years through ten years, Estimated Fair Value | 312,935 | 331,215
Due after ten years, Amortized Cost | 2,660,548 | 2,925,842
Due after ten years, Estimated Fair Value | 2,234,623 | 2,948,137
Total AFS securities | 3,204,361 | 3,448,784
Total AFS securities, Estimated Fair Value | 2,741,816 | 3,481,650
HTM Securities [Abstract] |  |
Due in one year or less, Carrying Value | 2,010 | 3,034
Due in one year or less, Estimated Fair Value | 2,006 | 3,027
Due after one year through five years, Carrying Value | 35,044 | 5,852
Due after one year through five years, Estimated Fair Value | 35,014 | 6,065
Due after five years through ten years, Carrying Value | 19,941 | 14,019
Due after five years through ten years, Estimated Fair Value | 20,239 | 15,984
Due after ten years, Carrying Value | 790,737 | 605,095
Due after ten years, Estimated Fair Value | 744,628 | 668,698
Total HTM Securities | 847,732 | 628,000
Total HTM securities, Estimated Fair Value | $ 801,887 | $ 693,774

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