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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Securities Available for Sale - Amortized Cost      
Due within one year    
Due after one year but within five years 19,498    
Due after five years but within ten years 29,322    
Due after ten years 5,000    
Mortgage-backed securities 162,660    
Total debt securities 216,480    
Equity securities    
Total securities 216,480 $ 202,414  
Securities Available for Sale - Fair Value      
Due within one year    
Due after one year but within five years 19,426    
Due after five years but within ten years 29,411    
Due after ten years 5,120    
Mortgage-backed securities 160,786    
Total debt securities 214,743    
Equity securities    
Total securities 214,743 199,329 $ 247,140
Securities Held to Maturity - Amortized Cost      
Due within one year 2,123    
Due after one year but within five years 21,815    
Due after five years but within ten years 27,398    
Due after ten years 5,717    
Mortgage-backed securities 76,201    
Total debt securities 133,254 129,713 148,485
Total securities 133,254    
Securities Held to Maturity - Fair Value      
Due within one year 2,144    
Due after one year but within five years 22,527    
Due after five years but within ten years 28,600    
Due after ten years 5,650    
Mortgage-backed securities 75,264    
Total debt securities 134,185    
Securities held to maturity $ 134,185 $ 130,195 $ 151,684