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Securities (Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Available-for-Sale, Amortized Cost    
Due in one year or less $ 6,785  
Due in one year through five years 13,156  
Due in five through ten years 48,051  
Due in over ten years 63,507  
Amortized cost 131,499 $ 146,461
Available-for-Sale, Estimated Fair Value    
Due in one year or less 6,783  
Due in one year through five years 13,194  
Due in five through ten years 48,168  
Due in over ten years 62,985  
Estimated fair value 131,130 145,893
Held-to-Maturity, Amortized Cost    
Due in one year or less 0  
Due in one year through five years 11,177  
Due in five through ten years 13,258  
Due in over ten years 14,438  
Amortized cost 38,873 38,612
Held-to-Maturity, Estimated Fair Value    
Due in one year or less 0  
Due in one year through five years 11,326  
Due in five through ten years 13,495  
Due in over ten years 14,453  
Estimated Fair Value $ 39,274 $ 38,520