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Investments (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Security
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Security
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized Cost $ 354,272   $ 354,272   $ 356,399
Gross Unrealized Gains 6,728   6,728   4,139
Gross Unrealized Losses (56)   (56)   (801)
Fair Value $ 360,944   $ 360,944   359,737
Number of securities owned with fair value less than cost | Security 17   17    
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than Twelve Months, Fair Value $ 16,678   $ 16,678   156,454
Twelve Months or Greater, Fair Value 2,490   2,490   5,279
Total, Fair Value 19,168   19,168   161,733
Less than Twelve Months, Gross Unrealized Losses (37)   (37)   (748)
Twelve Months or Greater, Gross Unrealized Losses (19)   (19)   (53)
Total, Gross Unrealized Losses (56)   $ (56)   (801)
Duration securities impaired, minimum     1 year    
Proceeds from sale of securities available-for-sale 7,057 $ 3,770 $ 12,077 $ 18,393  
Realized investment gains (losses) [Abstract]          
Gross gains 128 175 155 312  
Gross losses 0 0 0 (11)  
Net gains 128 $ 175 155 $ 301  
Investment securities pledged as collateral 221,900   221,900   203,800
Available-for-Sale Debt Securities, Amortized Cost [Abstract]          
Due in one year or less 41,555   41,555    
Due after one year through five years 190,450   190,450    
Due after five years through ten years 41,023   41,023    
Due after ten years 79,243   79,243    
Total 352,271   352,271    
Available-for-Sale Debt Securities, Fair Value [Abstract]          
Due in one year or less 41,758   41,758    
Due after one year through five years 193,673   193,673    
Due after five years through ten years 42,092   42,092    
Due after ten years 80,907   80,907    
Total 358,430   358,430    
U.S. Agency Securities [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized Cost 203,461   203,461   199,749
Gross Unrealized Gains 2,359   2,359   369
Gross Unrealized Losses (1)   (1)   (527)
Fair Value 205,819   205,819   199,591
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than Twelve Months, Fair Value 8,509   8,509   123,591
Twelve Months or Greater, Fair Value 0   0   0
Total, Fair Value 8,509   8,509   123,591
Less than Twelve Months, Gross Unrealized Losses (1)   (1)   (527)
Twelve Months or Greater, Gross Unrealized Losses 0   0   0
Total, Gross Unrealized Losses (1)   (1)   (527)
U.S. Treasury Securities [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized Cost 5,046   5,046   10,103
Gross Unrealized Gains 7   7   0
Gross Unrealized Losses 0   0   (21)
Fair Value 5,053   5,053   10,082
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than Twelve Months, Fair Value         10,082
Twelve Months or Greater, Fair Value         0
Total, Fair Value         10,082
Less than Twelve Months, Gross Unrealized Losses         (21)
Twelve Months or Greater, Gross Unrealized Losses         0
Total, Gross Unrealized Losses         (21)
Obligations of State and Political Subdivisions [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized Cost 101,144   101,144   99,856
Gross Unrealized Gains 3,338   3,338   3,080
Gross Unrealized Losses (10)   (10)   (73)
Fair Value 104,472   104,472   102,863
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than Twelve Months, Fair Value 4,342   4,342   7,023
Twelve Months or Greater, Fair Value 503   503   2,914
Total, Fair Value 4,845   4,845   9,937
Less than Twelve Months, Gross Unrealized Losses (9)   (9)   (57)
Twelve Months or Greater, Gross Unrealized Losses (1)   (1)   (16)
Total, Gross Unrealized Losses (10)   (10)   (73)
Corporate Obligations [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized Cost 11,430   11,430   14,583
Gross Unrealized Gains 50   50   68
Gross Unrealized Losses 0   0   (86)
Fair Value 11,480   11,480   14,565
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than Twelve Months, Fair Value         5,822
Twelve Months or Greater, Fair Value         2,138
Total, Fair Value         7,960
Less than Twelve Months, Gross Unrealized Losses         (61)
Twelve Months or Greater, Gross Unrealized Losses         (25)
Total, Gross Unrealized Losses         (86)
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 31,190   31,190   30,107
Gross Unrealized Gains 456   456   186
Gross Unrealized Losses (40)   (40)   (89)
Fair Value 31,606   31,606   30,204
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than Twelve Months, Fair Value 3,716   3,716   9,830
Twelve Months or Greater, Fair Value 1,987   1,987   227
Total, Fair Value 5,703   5,703   10,057
Less than Twelve Months, Gross Unrealized Losses (22)   (22)   (77)
Twelve Months or Greater, Gross Unrealized Losses (18)   (18)   (12)
Total, Gross Unrealized Losses (40)   (40)   (89)
Equity Securities in Financial Institutions [Member]          
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract]          
Amortized Cost 2,001   2,001   2,001
Gross Unrealized Gains 518   518   436
Gross Unrealized Losses (5)   (5)   (5)
Fair Value 2,514   2,514   2,432
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract]          
Less than Twelve Months, Fair Value 111   111   106
Twelve Months or Greater, Fair Value 0   0   0
Total, Fair Value 111   111   106
Less than Twelve Months, Gross Unrealized Losses (5)   (5)   (5)
Twelve Months or Greater, Gross Unrealized Losses 0   0   0
Total, Gross Unrealized Losses $ (5)   $ (5)   $ (5)