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Securities (Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Amortized Cost Available for Sale    
Due in one year or less $ 5,090  
Due in one year through five years 13,506  
Due in five through ten years 35,941  
Due in over ten years 72,789  
Amortized cost 127,326 $ 146,461
Estimated Fair Value Available for Sale    
Due in one year or less 5,080  
Due in one year through five years 13,416  
Due in five through ten years 35,642  
Due in over ten years 71,867  
Fair value 126,005 145,893
Amortized Cost Held to Maturity    
Due in one year or less 1,499  
Due in one year through five years 10,673  
Due in five through ten years 15,713  
Due in over ten years 9,893  
Amortized cost 37,778 38,612
Estimated Fair Value Held to Maturity    
Due in one year or less 1,490  
Due in one year through five years 10,704  
Due in five through ten years 15,734  
Due in over ten years 9,768  
Fair value $ 37,696 $ 38,520