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SECURITIES (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Abstract] |  |
Due in one year or less, Amortized Cost | $ 22,653 | $ 25,179
Due in one year or less, Estimated Fair Value | 22,789 | 25,326
Due after one year through five years, Amortized Cost | 191,003 | 145,276
Due after one year through five years, Estimated Fair Value | 188,999 | 145,980
Due after five years through ten years, Amortized Cost | 218,211 | 223,210
Due after five years through ten years, Estimated Fair Value | 217,304 | 226,251
Due after ten years, Amortized Cost | 1,349,085 | 577,674
Due after ten years, Estimated Fair Value | 1,345,729 | 576,665
Total securities available for sale, Amortized Cost | 1,780,952 | 971,339
Total securities available for sale, Estimated Fair Value | 1,774,821 | 974,222
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |
Due in one year or less, Carrying Value | 0 | 3,221
Due in one year or less, Estimated Fair Value | 0 | 3,230
Due after one year through five years, Carrying Value | 3,893 | 44,289
Due after one year through five years, Estimated Fair Value | 3,900 | 44,601
Due after five years through ten years, Carrying Value | 3,480 | 79,114
Due after five years through ten years, Estimated Fair Value | 3,507 | 80,532
Due after ten years, Carrying Value | 484,899 | 73,015
Due after ten years, Estimated Fair Value | 492,094 | 75,120
Held-to-maturity Securities, Total | 492,272 | 199,639
Total securities held to maturity, Estimated Fair Value | $ 499,501 | $ 203,483

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