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Securities (Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available-for-Sale, Amortized Cost    
Due in one year or less $ 1,518  
Due in one year through five years 20,998  
Due in five through ten years 30,083  
Due in over ten years 86,241  
Amortized cost 138,840 $ 127,326
Available-for-Sale, Estimated Fair Value    
Due in one year or less 1,515  
Due in one year through five years 20,448  
Due in five through ten years 29,269  
Due in over ten years 83,763  
Estimated fair value 134,995 126,005
Held-to-Maturity, Amortized Cost    
Due in one year or less 2,272  
Due in one year through five years 11,664  
Due in five through ten years 19,697  
Due in over ten years 6,317  
Amortized cost 39,950 37,778
Held-to-Maturity, Estimated Fair Value    
Due in one year or less 2,268  
Due in one year through five years 11,581  
Due in five through ten years 19,166  
Due in over ten years 6,115  
Estimated Fair Value $ 39,130 $ 37,696