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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Securities Available for Sale - Amortized Cost      
Due within one year    
Due after one year but within five years 16,498    
Due after five years but within ten years 28,812    
Due after ten years 5,000    
Mortgage-backed securities 156,934    
Total debt securities 207,244    
Total securities 207,244 $ 202,414  
Securities Available for Sale - Fair Value      
Due within one year    
Due after one year but within five years 16,498    
Due after five years but within ten years 29,287    
Due after ten years 5,110    
Mortgage-backed securities 156,601    
Total debt securities 207,496    
Total securities 207,496 199,329 $ 219,762
Securities Held to Maturity - Amortized Cost      
Due within one year 1,873    
Due after one year but within five years 23,718    
Due after five years but within ten years 24,251    
Due after ten years 5,767    
Mortgage-backed securities 72,257    
Total debt securities 127,866 129,713 142,073
Securities Held to Maturity - Fair Value      
Due within one year 1,888    
Due after one year but within five years 24,580    
Due after five years but within ten years 25,405    
Due after ten years 5,819    
Mortgage-backed securities 72,005    
Total debt securities 129,697    
Securities held to maturity $ 129,697 $ 130,195 $ 146,099