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Fair Value (Financial instruments Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Securities available for sale:      
Total available for sale securities $ 639,609 $ 501,351 $ 341,001
Impaired loans and foreclosed real estate:      
Foreclosed real estate 6,390 7,440 $ 11,307
Fair Value [Member]      
Securities available for sale:      
Total available for sale securities 639,609 501,351  
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 78,887 82,662  
Mortgage-backed securities 526,948 385,551  
Corporate bonds 33,774 33,138  
Total available for sale securities 639,609 501,351  
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 78,887 82,662  
Mortgage-backed securities 526,948 385,551  
Corporate bonds 33,774 33,138  
Total available for sale securities 639,609 501,351  
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 10,820 13,071  
Foreclosed real estate 6,390 7,440  
Nonrecurring [Member] | Fair Value [Member]      
Impaired loans and foreclosed real estate:      
Impaired loans 10,820 13,071  
Foreclosed real estate $ 6,390 $ 7,440