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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Securities available for sale:      
Amortized Cost $ 247,489 $ 166,778  
Fair Value 247,140 165,614 $ 172,319
Unrealized Gains 849 413  
Unrealized (Losses) (1,198) (1,577)  
Securities held to maturity:      
Amortized Cost 148,485 154,610 170,804
Fair Value 151,684 157,146 $ 174,756
Unrealized Gains 3,360 3,284  
Unrealized (Losses) (161) (748)  
Government-sponsored enterprises securities [Member]      
Securities available for sale:      
Amortized Cost 38,638 19,000  
Fair Value 38,636 18,972  
Unrealized Gains 4 1  
Unrealized (Losses) (6) (29)  
Mortgage-backed securities [Member]      
Securities available for sale:      
Amortized Cost 174,905 122,474  
Fair Value 174,579 121,553  
Unrealized Gains 666 348  
Unrealized (Losses) (992) (1,269)  
Securities held to maturity:      
Amortized Cost 98,102 102,509  
Fair Value 98,030 $ 101,767  
Unrealized Gains 87  
Unrealized (Losses) (159) $ (742)  
Corporate bonds [Member]      
Securities available for sale:      
Amortized Cost 33,863 25,216  
Fair Value 33,798 $ 24,946  
Unrealized Gains 126  
Unrealized (Losses) (191) $ (270)  
Equity securities [Member]      
Securities available for sale:      
Amortized Cost 83 88  
Fair Value 127 143  
Unrealized Gains 53 64  
Unrealized (Losses) (9) (9)  
States and local governments [Member]      
Securities held to maturity:      
Amortized Cost 50,383 52,101  
Fair Value 53,654 55,379  
Unrealized Gains 3,273 3,284  
Unrealized (Losses) $ (2) $ (6)