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Securities - Amortized Cost and Estimated Fair Value of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 8,850 | $ 5,980
Due after one year through five years | 86,520 | 51,936
Due after five years through ten years | 45,209 | 81,300
Due after ten years | 0 | 0
Total held-to-maturity debt securities | 140,579 | 139,216
Fair Value |  |
Due in one year or less | 8,832 | 5,979
Due after one year through five years | 85,645 | 52,227
Due after five years through ten years | 44,900 | 82,109
Due after ten years | 0 | 0
Total held-to-maturity debt securities | $ 139,377 | $ 140,315

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