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SECURITIES (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
AFS Securities [Abstract] |  |
Due in one year or less, Amortized Cost | $ 28,581 | $ 35,177
Due in one year or less, Estimated Fair Value | 28,834 | 35,329
Due after one year through five years, Amortized Cost | 140,844 | 164,605
Due after one year through five years, Estimated Fair Value | 148,114 | 166,873
Due after five years through ten years, Amortized Cost | 251,501 | 249,713
Due after five years through ten years, Estimated Fair Value | 258,806 | 254,790
Due after ten years, Amortized Cost | 1,931,990 | 1,443,932
Due after ten years, Estimated Fair Value | 2,007,586 | 1,488,453
Total AFS securities | 2,352,916 | 1,893,427
Total AFS securities, Estimated Fair Value | 2,443,340 | 1,945,445
HTM Securities [Abstract] |  |
Due in one year or less, Carrying Value | 1,005 | 502
Due in one year or less, Estimated Fair Value | 1,024 | 504
Due after one year through five years, Carrying Value | 9,076 | 10,258
Due after one year through five years, Estimated Fair Value | 9,436 | 10,539
Due after five years through ten years, Carrying Value | 1,749 | 1,768
Due after five years through ten years, Estimated Fair Value | 1,796 | 1,800
Due after ten years, Carrying Value | 534,831 | 542,616
Due after ten years, Estimated Fair Value | 601,917 | 590,660
Total HTM Securities | 546,661 | 555,144
Total HTM securities, Estimated Fair Value | $ 614,173 | $ 603,503

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