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Securities - Held To Maturity Securities Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 9,247 | $ 5,980
Due after one year through five years | 81,686 | 51,936
Due after five years through ten years | 50,303 | 81,300
Due after ten years |  | 0
Total held-to-maturity debt securities | 141,236 | 139,216
Fair Value |  |
Due in one year or less | 9,253 | 5,979
Due after one year through five years | 79,931 | 52,227
Due after five years through ten years | 49,048 | 82,109
Due after ten years |  | 0
Total held-to-maturity debt securities | $ 138,232 | $ 140,315

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