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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Securities available for sale:      
Amortized Cost $ 215,883 $ 158,708  
Fair Value 214,450 158,018 $ 118,062
Unrealized Gains 609 830  
Unrealized (Losses) (2,042) (1,520)  
Securities held to maturity:      
Amortized Cost 165,245 178,687 53,879
Fair Value 167,759 182,411 $ 57,612
Unrealized Gains 3,244 3,832  
Unrealized (Losses) (710) (108)  
Government-sponsored enterprises securities [Member]      
Securities available for sale:      
Amortized Cost 58,291 27,546  
Fair Value 58,276 27,521  
Unrealized Gains 53 33  
Unrealized (Losses) (68) (58)  
Mortgage-backed securities [Member]      
Securities available for sale:      
Amortized Cost 132,272 130,073  
Fair Value 131,309 129,510  
Unrealized Gains 461 751  
Unrealized (Losses) (1,424) (1,314)  
Securities held to maturity:      
Amortized Cost 112,923 124,924  
Fair Value $ 112,235 124,861  
Unrealized Gains   45  
Unrealized (Losses) $ (688) (108)  
Corporate bonds [Member]      
Securities available for sale:      
Amortized Cost 25,231 1,000  
Fair Value 24,733 $ 865  
Unrealized Gains 40    
Unrealized (Losses) (538) $ (135)  
Equity securities [Member]      
Securities available for sale:      
Amortized Cost 89 89  
Fair Value 132 122  
Unrealized Gains 55 46  
Unrealized (Losses) (12) (13)  
States and local governments [Member]      
Securities held to maturity:      
Amortized Cost 52,322 53,763  
Fair Value 55,524 57,550  
Unrealized Gains 3,224 $ 3,787  
Unrealized (Losses) $ (22)