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Securities - Held To Maturity Securities Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Amortized Cost    
Due in one year or less $ 8,105 $ 8,850
Due after one year through five years 86,335 86,520
Due after five years through ten years 45,202 45,209
Total held-to-maturity debt securities 139,642 140,579
Fair Value    
Due in one year or less 8,093 8,832
Due after one year through five years 86,381 85,645
Due after five years through ten years 45,948 44,900
Total held-to-maturity debt securities $ 140,422 $ 139,377