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SECURITIES (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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AFS Securities [Abstract] |  |
Due in one year or less, Amortized Cost | $ 18,007 | $ 19,875
Due in one year or less, Estimated Fair Value | 18,168 | 19,997
Due after one year through five years, Amortized Cost | 166,575 | 161,448
Due after one year through five years, Estimated Fair Value | 172,723 | 169,103
Due after five years through ten years, Amortized Cost | 233,566 | 235,021
Due after five years through ten years, Estimated Fair Value | 239,838 | 242,791
Due after ten years, Amortized Cost | 2,221,915 | 2,022,903
Due after ten years, Estimated Fair Value | 2,266,314 | 2,108,528
Total AFS securities | 2,640,063 | 2,439,247
Total AFS securities, Estimated Fair Value | 2,697,043 | 2,540,419
HTM Securities [Abstract] |  |
Due in one year or less, Carrying Value | 1,441 | 1,443
Due in one year or less, Estimated Fair Value | 1,449 | 1,460
Due after one year through five years, Carrying Value | 8,518 | 8,577
Due after one year through five years, Estimated Fair Value | 8,786 | 8,893
Due after five years through ten years, Carrying Value | 1,680 | 1,744
Due after five years through ten years, Estimated Fair Value | 1,719 | 1,805
Due after ten years, Carrying Value | 531,936 | 533,087
Due after ten years, Estimated Fair Value | 594,405 | 607,607
Total HTM Securities | 543,575 | 544,851
Total HTM securities, Estimated Fair Value | $ 606,359 | $ 619,765

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