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Investments (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Security
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]      
Amortized cost $ 253,725   $ 255,122
Gross unrealized gains 636   948
Gross unrealized losses (3,021)   (1,288)
Fair value $ 251,340   254,782
Number of securities owned with fair value less than cost | Security 138    
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]      
Less than twelve months, Fair value $ 159,867   145,686
Twelve months or greater, Fair value 34,463   36,708
Total, Fair value 194,330   182,394
Less than twelve months, Gross unrealized losses (2,257)   (875)
Twelve months or greater, Gross unrealized losses (764)   (413)
Total, Gross Unrealized Losses (3,021)   (1,288)
Proceeds from sale of securities available-for-sale 0 $ 18,766  
Realized investment gains (losses) [Abstract]      
Gross gains on available for sale securities 0 172  
Gross losses on available for sale securities 0 0  
Net gains 0 172  
Equity Securities Fv Ni Gain Loss [Abstract]      
Net gains recognized in equity securities during the period 6 $ 0  
Less: Net gains realized on the sale of equity securities during the period 0    
Net gains 6    
Investment securities pledged as collateral 242,900   243,400
Available-for-Sale Debt Securities, Amortized Cost [Abstract]      
Due in one year or less 37,488    
Due after one year through five years 120,367    
Due after five years through ten years 42,684    
Due after ten years 53,186    
Total 253,725    
Available-for-Sale Debt Securities, Fair Value [Abstract]      
Due in one year or less 37,579    
Due after one year through five years 118,940    
Due after five years through ten years 42,068    
Due after ten years 52,753    
Total 251,340   254,782
U.S. Agency Securities [Member]      
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]      
Amortized cost 100,256   99,454
Gross unrealized gains 3   26
Gross unrealized losses (1,073)   (593)
Fair value 99,186   98,887
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]      
Less than twelve months, Fair value 70,435   74,952
Twelve months or greater, Fair value 16,851   16,928
Total, Fair value 87,286   91,880
Less than twelve months, Gross unrealized losses (824)   (421)
Twelve months or greater, Gross unrealized losses (249)   (172)
Total, Gross Unrealized Losses (1,073)   (593)
Available-for-Sale Debt Securities, Fair Value [Abstract]      
Total 99,186   98,887
U.S. Treasury Securities [Member]      
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]      
Amortized cost 33,768   28,782
Gross unrealized gains 0   0
Gross unrealized losses (656)   (178)
Fair value 33,112   28,604
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]      
Less than twelve months, Fair value 33,112   28,604
Twelve months or greater, Fair value 0   0
Total, Fair value 33,112   28,604
Less than twelve months, Gross unrealized losses (656)   (178)
Twelve months or greater, Gross unrealized losses 0   0
Total, Gross Unrealized Losses (656)   (178)
Available-for-Sale Debt Securities, Fair Value [Abstract]      
Total 33,112   28,604
Obligations of State and Political Subdivisions [Member]      
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]      
Amortized cost 71,365   78,409
Gross unrealized gains 580   820
Gross unrealized losses (413)   (139)
Fair value 71,532   79,090
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]      
Less than twelve months, Fair value 27,327   14,885
Twelve months or greater, Fair value 4,795   5,958
Total, Fair value 32,122   20,843
Less than twelve months, Gross unrealized losses (298)   (85)
Twelve months or greater, Gross unrealized losses (115)   (54)
Total, Gross Unrealized Losses (413)   (139)
Available-for-Sale Debt Securities, Fair Value [Abstract]      
Total 71,532   79,090
Corporate Obligations [Member]      
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]      
Amortized cost 3,000   3,000
Gross unrealized gains 50   83
Gross unrealized losses 0   0
Fair value 3,050   3,083
Available-for-Sale Debt Securities, Fair Value [Abstract]      
Total 3,050   3,083
Mortgage-backed Securities in Government Sponsored Entities [Member]      
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]      
Amortized cost 45,336   45,385
Gross unrealized gains 3   19
Gross unrealized losses (879)   (377)
Fair value 44,460   45,027
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]      
Less than twelve months, Fair value 28,993   27,154
Twelve months or greater, Fair value 12,817   13,822
Total, Fair value 41,810   40,976
Less than twelve months, Gross unrealized losses (479)   (190)
Twelve months or greater, Gross unrealized losses (400)   (187)
Total, Gross Unrealized Losses (879)   (377)
Available-for-Sale Debt Securities, Fair Value [Abstract]      
Total $ 44,460   45,027
Equity Securities in Financial Institutions [Member]      
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]      
Amortized cost     92
Gross unrealized gains     0
Gross unrealized losses     (1)
Fair value     91
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]      
Less than twelve months, Fair value     91
Twelve months or greater, Fair value     0
Total, Fair value     91
Less than twelve months, Gross unrealized losses     (1)
Twelve months or greater, Gross unrealized losses     0
Total, Gross Unrealized Losses     (1)
Available-for-Sale Debt Securities, Fair Value [Abstract]      
Total     $ 91