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Securities (Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Available-for-Sale, Amortized Cost    
Due in one year or less $ 6,795  
Due in one year through five years 19,891  
Due in five through ten years 29,450  
Due in over ten years 82,545  
Amortized cost 138,681 $ 127,326
Available-for-Sale, Estimated Fair Value    
Due in one year or less 6,786  
Due in one year through five years 19,445  
Due in five through ten years 28,819  
Due in over ten years 80,420  
Estimated fair value 135,470 126,005
Held-to-Maturity, Amortized Cost    
Due in one year or less 2,273  
Due in one year through five years 11,465  
Due in five through ten years 20,209  
Due in over ten years 6,999  
Amortized cost 40,946 37,778
Held-to-Maturity, Estimated Fair Value    
Due in one year or less 2,267  
Due in one year through five years 11,441  
Due in five through ten years 19,821  
Due in over ten years 6,811  
Estimated Fair Value $ 40,340 $ 37,696