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Securities (Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Available-for-Sale, Amortized Cost    
Due in one year or less $ 3,894  
Due in one year through five years 19,198  
Due in five through ten years 31,867  
Due in over ten years 75,682  
Amortized cost 130,641 $ 127,326
Available-for-Sale, Estimated Fair Value    
Due in one year or less 3,886  
Due in one year through five years 18,836  
Due in five through ten years 31,274  
Due in over ten years 73,965  
Estimated fair value 127,961 126,005
Held-to-Maturity, Amortized Cost    
Due in one year or less 1,700  
Due in one year through five years 10,819  
Due in five through ten years 20,298  
Due in over ten years 9,068  
Amortized cost 41,885 37,778
Held-to-Maturity, Estimated Fair Value    
Due in one year or less 1,691  
Due in one year through five years 10,786  
Due in five through ten years 20,032  
Due in over ten years 8,900  
Estimated Fair Value $ 41,409 $ 37,696