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SECURITIES (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
AFS Securities [Abstract] |  |
Due in one year or less, Amortized Cost | $ 23,826 | $ 18,247
Due in one year or less, Estimated Fair Value | 23,702 | 18,317
Due after one year through five years, Amortized Cost | 179,752 | 180,080
Due after one year through five years, Estimated Fair Value | 179,192 | 183,981
Due after five years through ten years, Amortized Cost | 344,061 | 324,615
Due after five years through ten years, Estimated Fair Value | 335,913 | 331,215
Due after ten years, Amortized Cost | 2,852,341 | 2,925,842
Due after ten years, Estimated Fair Value | 2,654,473 | 2,948,137
Total AFS securities | 3,399,980 | 3,448,784
Total AFS securities, Estimated Fair Value | 3,193,280 | 3,481,650
HTM Securities [Abstract] |  |
Due in one year or less, Carrying Value | 5,061 | 3,034
Due in one year or less, Estimated Fair Value | 5,018 | 3,027
Due after one year through five years, Carrying Value | 10,381 | 5,852
Due after one year through five years, Estimated Fair Value | 10,827 | 6,065
Due after five years through ten years, Carrying Value | 15,877 | 14,019
Due after five years through ten years, Estimated Fair Value | 16,537 | 15,984
Due after ten years, Carrying Value | 725,553 | 605,095
Due after ten years, Estimated Fair Value | 727,795 | 668,698
Total HTM Securities | 756,872 | 628,000
Total HTM securities, Estimated Fair Value | $ 760,177 | $ 693,774

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