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Securities - Held To Maturity Securities Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Amortized Cost    
Due in one year or less $ 14,385 $ 8,850
Due after one year through five years 96,145 86,520
Due after five years through ten years 30,031 45,209
Total held-to-maturity debt securities 140,561 140,579
Fair Value    
Due in one year or less 14,402 8,832
Due after one year through five years 97,892 85,645
Due after five years through ten years 31,254 44,900
Total held-to-maturity debt securities $ 143,548 $ 139,377