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Fair Value (Financial instruments Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Securities available for sale:      
Total available for sale securities $ 353,068 $ 343,270 $ 198,924
Impaired loans and foreclosed real estate:      
Foreclosed real estate 6,140 12,571 $ 9,356
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Securities available for sale:      
Total available for sale securities 353,068 343,270  
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 43,422 13,867  
Mortgage-backed securities 276,474 295,213  
Corporate bonds 33,172 34,190  
Total available for sale securities 353,068 343,270  
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 43,422 13,867  
Mortgage-backed securities 276,474 295,213  
Corporate bonds 33,172 34,190  
Total available for sale securities 353,068 343,270  
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 13,820 14,086  
Foreclosed real estate 6,140 12,571  
Nonrecurring [Member] | Fair Value [Member]      
Impaired loans and foreclosed real estate:      
Impaired loans 13,820 14,086  
Foreclosed real estate $ 6,140 $ 12,571