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Securities - Amortized Cost and Estimated Fair Value Of Held-To-Maturity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Amortized Cost    
Due in one year or less $ 6,483 $ 7,452
Due after one year through five years 42,080 27,480
Due after five years through ten years 91,405 107,187
Due after ten years   0
Total held-to-maturity debt securities 139,968 142,119
Fair Value    
Due in one year or less 6,495 7,469
Due after one year through five years 42,764 27,866
Due after five years through ten years 92,748 107,497
Due after ten years   0
Total held-to-maturity debt securities $ 142,007 $ 142,832