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Investments (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Security
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Security
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized cost $ 272,701   $ 272,701   $ 312,039
Gross unrealized gains 2,922   2,922   3,087
Gross unrealized losses (415)   (415)   (1,109)
Fair value $ 275,208   $ 275,208   314,017
Number of securities owned with fair value less than cost | Security 63   63    
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than twelve months, Fair value $ 79,694   $ 79,694   106,062
Twelve months or greater, Fair value 7,543   7,543   1,520
Total, Fair value 87,237   87,237   107,582
Less than twelve months, Gross unrealized losses (331)   (331)   (1,071)
Twelve months or greater, Gross unrealized losses (84)   (84)   (38)
Total, Gross Unrealized Losses (415)   (415)   (1,109)
Proceeds from sale of securities available-for-sale 6,641 $ 7,057 25,407 $ 12,077  
Realized investment gains (losses) [Abstract]          
Gross gains 30 128 202 155  
Gross losses (7) 0 (7) 0  
Net gains 23 $ 128 195 $ 155  
Investment securities pledged as collateral 233,400   233,400   206,300
Available-for-Sale Debt Securities, Amortized Cost [Abstract]          
Due in one year or less 46,659   46,659    
Due after one year through five years 130,797   130,797    
Due after five years through ten years 37,314   37,314    
Due after ten years 57,031   57,031    
Total 271,801   271,801    
Available-for-Sale Debt Securities, Fair Value [Abstract]          
Due in one year or less 46,812   46,812    
Due after one year through five years 131,827   131,827    
Due after five years through ten years 37,598   37,598    
Due after ten years 57,300   57,300    
Total 273,537   $ 273,537    
Minimum [Member]          
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Duration securities impaired     1 year    
U.S. Agency Securities [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized cost 142,581   $ 142,581   170,276
Gross unrealized gains 315   315   407
Gross unrealized losses (146)   (146)   (269)
Fair value 142,750   142,750   170,414
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than twelve months, Fair value 53,010   53,010   50,947
Twelve months or greater, Fair value 995   995   0
Total, Fair value 54,005   54,005   50,947
Less than twelve months, Gross unrealized losses (142)   (142)   (269)
Twelve months or greater, Gross unrealized losses (4)   (4)   0
Total, Gross Unrealized Losses (146)   (146)   (269)
U.S. Treasury Securities [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized cost         2,999
Gross unrealized gains         1
Gross unrealized losses         0
Fair value         3,000
Obligations of State and Political Subdivisions [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized cost 84,731   84,731   95,956
Gross unrealized gains 1,578   1,578   1,463
Gross unrealized losses (93)   (93)   (493)
Fair value 86,216   86,216   96,926
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than twelve months, Fair value 7,811   7,811   28,398
Twelve months or greater, Fair value 5,171   5,171   767
Total, Fair value 12,982   12,982   29,165
Less than twelve months, Gross unrealized losses (40)   (40)   (472)
Twelve months or greater, Gross unrealized losses (53)   (53)   (21)
Total, Gross Unrealized Losses (93)   (93)   (493)
Corporate Obligations [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized cost 3,000   3,000   3,000
Gross unrealized gains 111   111   50
Gross unrealized losses 0   0   0
Fair value 3,111   3,111   3,050
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 41,489   41,489   37,987
Gross unrealized gains 147   147   88
Gross unrealized losses (176)   (176)   (347)
Fair value 41,460   41,460   37,728
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than twelve months, Fair value 18,873   18,873   26,717
Twelve months or greater, Fair value 1,377   1,377   753
Total, Fair value 20,250   20,250   27,470
Less than twelve months, Gross unrealized losses (149)   (149)   (330)
Twelve months or greater, Gross unrealized losses (27)   (27)   (17)
Total, Gross Unrealized Losses (176)   (176)   (347)
Equity Securities in Financial Institutions [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized cost 900   900   1,821
Gross unrealized gains 771   771   1,078
Gross unrealized losses 0   0   0
Fair value $ 1,671   $ 1,671   $ 2,899