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Securities (Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Available-for-Sale, Amortized Cost    
Due in one year or less $ 7,250  
Due in one year through five years 13,409  
Due in five through ten years 56,104  
Due in over ten years 60,612  
Amortized cost 137,375 $ 146,461
Available-for-Sale, Estimated Fair Value    
Due in one year or less 7,242  
Due in one year through five years 13,422  
Due in five through ten years 56,171  
Due in over ten years 59,999  
Estimated fair value 136,834 145,893
Held-to-Maturity, Amortized Cost    
Due in one year or less 0  
Due in one year through five years 11,191  
Due in five through ten years 12,302  
Due in over ten years 14,313  
Amortized cost 37,806 38,612
Held-to-Maturity, Estimated Fair Value    
Due in one year or less 0  
Due in one year through five years 11,313  
Due in five through ten years 12,533  
Due in over ten years 14,306  
Estimated Fair Value $ 38,152 $ 38,520