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SECURITIES (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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AFS Securities [Abstract] |  |
Due in one year or less, Amortized Cost | $ 27,404 | $ 35,177
Due in one year or less, Estimated Fair Value | 27,621 | 35,329
Due after one year through five years, Amortized Cost | 148,289 | 164,605
Due after one year through five years, Estimated Fair Value | 155,504 | 166,873
Due after five years through ten years, Amortized Cost | 233,029 | 249,713
Due after five years through ten years, Estimated Fair Value | 237,974 | 254,790
Due after ten years, Amortized Cost | 1,521,265 | 1,443,932
Due after ten years, Estimated Fair Value | 1,598,065 | 1,488,453
Total AFS securities | 1,929,987 | 1,893,427
Total AFS securities, Estimated Fair Value | 2,019,164 | 1,945,445
HTM Securities [Abstract] |  |
Due in one year or less, Carrying Value | 1,007 | 502
Due in one year or less, Estimated Fair Value | 1,028 | 504
Due after one year through five years, Carrying Value | 9,133 | 10,258
Due after one year through five years, Estimated Fair Value | 9,490 | 10,539
Due after five years through ten years, Carrying Value | 1,754 | 1,768
Due after five years through ten years, Estimated Fair Value | 1,777 | 1,800
Due after ten years, Carrying Value | 535,667 | 542,616
Due after ten years, Estimated Fair Value | 601,134 | 590,660
Total HTM Securities | 547,561 | 555,144
Total HTM securities, Estimated Fair Value | $ 613,429 | $ 603,503

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