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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