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Securities (Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Available-for-Sale, Amortized Cost    
Due in one year or less $ 5,084  
Due in one year through five years 15,961  
Due in five through ten years 63,774  
Due in over ten years 62,890  
Amortized cost 147,709 $ 146,461
Available-for-Sale, Estimated Fair Value    
Due in one year or less 5,083  
Due in one year through five years 15,933  
Due in five through ten years 63,937  
Due in over ten years 62,105  
Estimated fair value 147,058 145,893
Held-to-Maturity, Amortized Cost    
Due in one year or less 0  
Due in one year through five years 8,928  
Due in five through ten years 13,284  
Due in over ten years 16,273  
Amortized cost 38,485 38,612
Held-to-Maturity, Estimated Fair Value    
Due in one year or less 0  
Due in one year through five years 8,978  
Due in five through ten years 13,370  
Due in over ten years 16,207  
Estimated Fair Value $ 38,555 $ 38,520