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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Securities Available for Sale - Amortized Cost      
Due within one year    
Due after one year but within five years 3,000    
Due after five years but within ten years 28,842    
Due after ten years 5,000    
Mortgage-backed securities 160,267    
Total debt securities 197,109    
Equity securities 83    
Total securities 197,192 $ 166,778  
Securities Available for Sale - Fair Value      
Due within one year    
Due after one year but within five years 2,999    
Due after five years but within ten years 29,556    
Due after ten years 5,015    
Mortgage-backed securities 161,443    
Total debt securities 199,013    
Equity securities 143    
Total securities 199,156 165,614 $ 178,765
Securities Held to Maturity - Amortized Cost      
Due within one year 1,556    
Due after one year but within five years 16,913    
Due after five years but within ten years 29,711    
Due after ten years 1,165    
Mortgage-backed securities 86,463    
Total debt securities 135,808 154,610 160,048
Total securities 135,808    
Securities Held to Maturity - Fair Value      
Due within one year 1,571    
Due after one year but within five years 17,703    
Due after five years but within ten years 31,818    
Due after ten years 1,173    
Mortgage-backed securities 87,249    
Total debt securities 139,514    
Securities held to maturity $ 139,514 $ 157,146 $ 162,858