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Securities - Schedule of Held-to-Maturity Securities Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 17,696 | $ 8,850
Due after one year through five years | 95,979 | 86,520
Due after five years through ten years | 24,982 | 45,209
Total held-to-maturity debt securities | 138,657 | 140,579
Fair Value |  |
Due in one year or less | 17,744 | 8,832
Due after one year through five years | 98,494 | 85,645
Due after five years through ten years | 26,345 | 44,900
Total held-to-maturity debt securities | $ 142,583 | $ 139,377

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