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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Securities Available for Sale - Amortized Cost      
Due within one year    
Due after one year but within five years 10,008    
Due after five years but within ten years 27,794    
Due after ten years 5,000    
Mortgage-backed securities 155,684    
Total debt securities 198,486    
Securities Available for Sale - Fair Value      
Due within one year    
Due after one year but within five years 10,037    
Due after five years but within ten years 28,242    
Due after ten years 5,110    
Mortgage-backed securities 155,535    
Total debt securities 198,924    
Securities Held to Maturity - Amortized Cost      
Due within one year 1,872    
Due after one year but within five years 23,907    
Due after five years but within ten years 23,979    
Due after ten years 5,690    
Mortgage-backed securities 67,708    
Total debt securities 123,156 $ 129,713 $ 135,808
Securities Held to Maturity - Fair Value      
Due within one year 1,883    
Due after one year but within five years 24,681    
Due after five years but within ten years 25,040    
Due after ten years 5,745    
Mortgage-backed securities 67,529    
Securities held to maturity $ 124,878 $ 130,195 $ 139,514