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Fair Value (Financial instruments Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Securities available for sale:      
Total available for sale securities $ 341,001 $ 343,270 $ 214,743
Impaired loans and foreclosed real estate:      
Foreclosed real estate 11,307 12,571 $ 12,789
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Securities available for sale:      
Total available for sale securities 341,001 343,270  
Recurring [Member] | Quoted Prices in Markets for Identical Assets (Level 1) [Member]      
Securities available for sale:      
Government-sponsored enterprise securities  
Mortgage-backed securities  
Corporate bonds  
Total available for sale securities  
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Securities available for sale:      
Government-sponsored enterprise securities 18,604 13,867  
Mortgage-backed securities 288,924 295,213  
Corporate bonds 33,473 34,190  
Total available for sale securities 341,001 343,270  
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Securities available for sale:      
Government-sponsored enterprise securities  
Mortgage-backed securities  
Corporate bonds  
Total available for sale securities  
Recurring [Member] | Fair Value [Member]      
Securities available for sale:      
Government-sponsored enterprise securities 18,604 13,867  
Mortgage-backed securities 288,924 295,213  
Corporate bonds 33,473 34,190  
Total available for sale securities 341,001 343,270  
Nonrecurring [Member] | Quoted Prices in Markets for Identical Assets (Level 1) [Member]      
Impaired loans and foreclosed real estate:      
Impaired loans  
Foreclosed real estate  
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Impaired loans and foreclosed real estate:      
Impaired loans  
Foreclosed real estate  
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Impaired loans and foreclosed real estate:      
Impaired loans 13,057 14,086  
Foreclosed real estate 11,307 12,571  
Nonrecurring [Member] | Fair Value [Member]      
Impaired loans and foreclosed real estate:      
Impaired loans 13,057 14,086  
Foreclosed real estate $ 11,307 $ 12,571