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Securities Available-for-Sale (Details) - Investments classified by maturity date - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Investment Securities:    
Due in one year or less, amortized cost $ 9,526  
Due in one year or less, fair value 9,518  
Due after one year through five years, amortized cost 28,768  
Due after one year through five years, fair value 28,857  
Due after five years through ten years, amortized cost 36,318  
Due after five years through ten years, fair value 36,369  
Due after ten years, amortized cost 153,610  
Due after ten years, fair value 150,831  
Total, amortized cost 430,810 $ 436,868
Total, fair value 424,322  
Residential mortgage pass-through securities [Member]    
Investment Securities:    
Total, amortized cost 192,537 183,509
Total, fair value 188,757  
Commercial mortgage pass-through securities [Member]    
Investment Securities:    
Total, amortized cost 4,020 4,054
Total, fair value 3,959  
Equity Securities [Member]    
Investment Securities:    
Total, amortized cost   11,843
Other Securities [Member]    
Investment Securities:    
Total, amortized cost 6,031 $ 3,422
Total, fair value $ 6,031