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SECURITIES (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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AFS Securities [Abstract] |  |
Due in one year or less, Amortized Cost | $ 11,823 | $ 19,875
Due in one year or less, Estimated Fair Value | 11,927 | 19,997
Due after one year through five years, Amortized Cost | 175,393 | 161,448
Due after one year through five years, Estimated Fair Value | 180,836 | 169,103
Due after five years through ten years, Amortized Cost | 316,877 | 235,021
Due after five years through ten years, Estimated Fair Value | 325,440 | 242,791
Due after ten years, Amortized Cost | 2,646,163 | 2,022,903
Due after ten years, Estimated Fair Value | 2,676,973 | 2,108,528
Total AFS securities | 3,150,256 | 2,439,247
Total AFS securities, Estimated Fair Value | 3,195,176 | 2,540,419
HTM Securities [Abstract] |  |
Due in one year or less, Carrying Value | 3,501 | 1,443
Due in one year or less, Estimated Fair Value | 3,512 | 1,460
Due after one year through five years, Carrying Value | 5,890 | 8,577
Due after one year through five years, Estimated Fair Value | 6,142 | 8,893
Due after five years through ten years, Carrying Value | 14,061 | 1,744
Due after five years through ten years, Estimated Fair Value | 16,091 | 1,805
Due after ten years, Carrying Value | 512,270 | 533,087
Due after ten years, Estimated Fair Value | 572,707 | 607,607
Total HTM Securities | 535,722 | 544,851
Total HTM securities, Estimated Fair Value | $ 598,452 | $ 619,765

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