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SECURITIES (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
AFS Securities [Abstract] |  |
Due in one year or less, Amortized Cost | $ 24,916 | $ 35,177
Due in one year or less, Estimated Fair Value | 25,080 | 35,329
Due after one year through five years, Amortized Cost | 157,141 | 164,605
Due after one year through five years, Estimated Fair Value | 162,774 | 166,873
Due after five years through ten years, Amortized Cost | 221,929 | 249,713
Due after five years through ten years, Estimated Fair Value | 228,121 | 254,790
Due after ten years, Amortized Cost | 1,496,327 | 1,443,932
Due after ten years, Estimated Fair Value | 1,556,928 | 1,488,453
Total AFS securities | 1,900,313 | 1,893,427
Total AFS securities, Estimated Fair Value | 1,972,903 | 1,945,445
HTM Securities [Abstract] |  |
Due in one year or less, Carrying Value | 0 | 502
Due in one year or less, Estimated Fair Value | 0 | 504
Due after one year through five years, Carrying Value | 10,198 | 10,258
Due after one year through five years, Estimated Fair Value | 10,411 | 10,539
Due after five years through ten years, Carrying Value | 1,760 | 1,768
Due after five years through ten years, Estimated Fair Value | 1,767 | 1,800
Due after ten years, Carrying Value | 540,218 | 542,616
Due after ten years, Estimated Fair Value | 592,602 | 590,660
Total HTM Securities | 552,176 | 555,144
Total HTM securities, Estimated Fair Value | $ 604,780 | $ 603,503

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