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SECURITIES (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 21,087 | $ 22,653
Due after one year through five years | 280,969 | 191,003
Due after five years through ten years | 257,437 | 218,211
Due after ten years | 1,529,358 | 1,349,085
Total AFS securities | 2,088,851 | 1,780,952
Estimated Fair Value |  |
Due in one year or less | 21,214 | 22,789
Due after one year through five years | 281,047 | 188,999
Due after five years through ten years | 258,813 | 217,304
Due after ten years | 1,547,988 | 1,345,729
Total AFS securities | 2,109,062 | 1,774,821
Carrying Value |  |
Due in one year or less | 252 | 0
Due after one year through five years | 8,212 | 3,893
Due after five years through ten years | 4,010 | 3,480
Due after ten years | 546,906 | 484,899
Total HTM securities | 559,380 | 492,272
Estimated Fair Value |  |
Due in one year or less | 252 | 0
Due after one year through five years | 8,332 | 3,900
Due after five years through ten years | 4,054 | 3,507
Due after ten years | 571,968 | 492,094
Total HTM securities | $ 584,606 | $ 499,501

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