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Investments (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Security
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Security
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized Cost $ 295,983   $ 295,983   $ 301,459
Gross Unrealized Gains 4,915   4,915   5,603
Gross Unrealized Losses (268)   (268)   (916)
Fair Value $ 300,630   $ 300,630   306,146
Number of securities owned with fair value than cost | Security 46   46    
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than Twelve Months, Fair Value $ 37,506   $ 37,506   36,508
Twelve Months or Greater, Fair Value 18,150   18,150   67,011
Total, Fair Value 55,656   55,656   103,519
Less than Twelve Months, Gross Unrealized Losses (184)   (184)   (134)
Twelve Months or Greater, Gross Unrealized Losses (84)   (84)   (782)
Total, Gross Unrealized Losses $ (268)   (268)   (916)
Duration securities impaired, Minimum 1 year        
Proceeds from sale of securities available-for-sale $ 5,187 $ 5,187 18,393 $ 17,338  
Realized investment gains (losses) [Abstract]          
Gross gains 129 242 441 488  
Gross losses 0 0 (11) 0  
Net gains 129 $ 242 430 $ 488  
Investment securities pledged as collateral 182,700   182,700   186,400
Amortized Cost [Abstract]          
Due in one year or less 6,593   6,593    
Due after one year through five years 161,984   161,984    
Due after five years through ten years 44,998   44,998    
Due after ten years 81,089   81,089    
Total 294,664   294,664    
Fair Value [Abstract]          
Due in one year or less 6,606   6,606    
Due after one year through five years 163,761   163,761    
Due after five years through ten years 46,018   46,018    
Due after ten years 82,488   82,488    
Total 298,873   298,873    
U.S. Agency Securities [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized Cost 163,012   163,012   150,847
Gross Unrealized Gains 1,113   1,113   638
Gross Unrealized Losses (23)   (23)   (600)
Fair Value 164,102   164,102   150,885
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than Twelve Months, Fair Value 10,067   10,067   27,382
Twelve Months or Greater, Fair Value 10,986   10,986   43,642
Total, Fair Value 21,053   21,053   71,024
Less than Twelve Months, Gross Unrealized Losses (16)   (16)   (110)
Twelve Months or Greater, Gross Unrealized Losses (7)   (7)   (490)
Total, Gross Unrealized Losses (23)   (23)   (600)
US Treasury Securities [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized Cost         4,944
Gross Unrealized Gains         0
Gross Unrealized Losses         (95)
Fair Value         4,849
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than Twelve Months, Fair Value         0
Twelve Months or Greater, Fair Value         4,849
Total, Fair Value         4,849
Less than Twelve Months, Gross Unrealized Losses         0
Twelve Months or Greater, Gross Unrealized Losses         (95)
Total, Gross Unrealized Losses         (95)
Obligations of State and Political Subdivisions [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized Cost 95,374   95,374   101,281
Gross Unrealized Gains 2,946   2,946   3,854
Gross Unrealized Losses (155)   (155)   (99)
Fair Value 98,165   98,165   105,036
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than Twelve Months, Fair Value 17,133   17,133   3,596
Twelve Months or Greater, Fair Value 4,747   4,747   8,584
Total, Fair Value 21,880   21,880   12,180
Less than Twelve Months, Gross Unrealized Losses (104)   (104)   (19)
Twelve Months or Greater, Gross Unrealized Losses (51)   (51)   (80)
Total, Gross Unrealized Losses (155)   (155)   (99)
Corporate Obligations [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized Cost 12,643   12,643   13,853
Gross Unrealized Gains 103   103   190
Gross Unrealized Losses (39)   (39)   (85)
Fair Value 12,707   12,707   13,958
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than Twelve Months, Fair Value 5,399   5,399   505
Twelve Months or Greater, Fair Value 2,167   2,167   7,707
Total, Fair Value 7,566   7,566   8,212
Less than Twelve Months, Gross Unrealized Losses (23)   (23)   (1)
Twelve Months or Greater, Gross Unrealized Losses (16)   (16)   (84)
Total, Gross Unrealized Losses (39)   (39)   (85)
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 23,635   23,635   29,397
Gross Unrealized Gains 305   305   368
Gross Unrealized Losses (41)   (41)   (37)
Fair Value 23,899   23,899   29,728
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than Twelve Months, Fair Value 4,317   4,317   5,025
Twelve Months or Greater, Fair Value 250   250   2,229
Total, Fair Value 4,567   4,567   7,254
Less than Twelve Months, Gross Unrealized Losses (31)   (31)   (4)
Twelve Months or Greater, Gross Unrealized Losses (10)   (10)   (33)
Total, Gross Unrealized Losses (41)   (41)   (37)
Equity Securities in Financial Institutions [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized Cost 1,319   1,319   1,137
Gross Unrealized Gains 448   448   553
Gross Unrealized Losses (10)   (10)   0
Fair Value 1,757   1,757   $ 1,690
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than Twelve Months, Fair Value 590   590    
Twelve Months or Greater, Fair Value 0   0    
Total, Fair Value 590   590    
Less than Twelve Months, Gross Unrealized Losses (10)   (10)    
Twelve Months or Greater, Gross Unrealized Losses 0   0    
Total, Gross Unrealized Losses $ (10)   $ (10)