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Investments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) Security | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) Security | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |  |  |
Amortized Cost | $ 343,532 |  | $ 343,532 |  | $ 356,399
Gross Unrealized Gains | 5,701 |  | 5,701 |  | 4,139
Gross Unrealized Losses | (79) |  | (79) |  | (801)
Fair Value | $ 349,154 |  | $ 349,154 |  | 359,737
Number of securities owned with fair value less than cost | Security | 24 |  | 24 |  |
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than Twelve Months, Fair Value | $ 19,810 |  | $ 19,810 |  | 156,454
Twelve Months or Greater, Fair Value | 1,855 |  | 1,855 |  | 5,279
Total, Fair Value | 21,665 |  | 21,665 |  | 161,733
Less than Twelve Months, Gross Unrealized Losses | (64) |  | (64) |  | (748)
Twelve Months or Greater, Gross Unrealized Losses | (15) |  | (15) |  | (53)
Total, Gross Unrealized Losses | (79) |  | $ (79) |  | (801)
Duration securities impaired, minimum |  |  | 1 year |  |
Proceeds from sale of securities available-for-sale | 0 | $ 5,187 | $ 12,077 | $ 18,393 |
Realized investment gains (losses) [Abstract] |  |  |  |  |
Gross gains | 0 | 129 | 155 | 441 |
Gross losses | 0 | 0 | 0 | (11) |
Net gains | 0 | $ 129 | 155 | $ 430 |
Investment securities pledged as collateral | 224,900 |  | 224,900 |  | 203,800
Available-for-Sale Debt Securities, Amortized Cost [Abstract] |  |  |  |  |
Due in one year or less | 49,510 |  | 49,510 |  |
Due after one year through five years | 173,075 |  | 173,075 |  |
Due after five years through ten years | 41,247 |  | 41,247 |  |
Due after ten years | 77,698 |  | 77,698 |  |
Total | 341,530 |  | 341,530 |  |
Available-for-Sale Debt Securities, Fair Value [Abstract] |  |  |  |  |
Due in one year or less | 49,724 |  | 49,724 |  |
Due after one year through five years | 175,690 |  | 175,690 |  |
Due after five years through ten years | 42,129 |  | 42,129 |  |
Due after ten years | 78,893 |  | 78,893 |  |
Total | 346,436 |  | 346,436 |  |
U.S. Agency Securities [Member] |  |  |  |  |
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |  |  |
Amortized Cost | 188,936 |  | 188,936 |  | 199,749
Gross Unrealized Gains | 1,839 |  | 1,839 |  | 369
Gross Unrealized Losses | (9) |  | (9) |  | (527)
Fair Value | 190,766 |  | 190,766 |  | 199,591
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than Twelve Months, Fair Value | 6,998 |  | 6,998 |  | 123,591
Twelve Months or Greater, Fair Value | 0 |  | 0 |  | 0
Total, Fair Value | 6,998 |  | 6,998 |  | 123,591
Less than Twelve Months, Gross Unrealized Losses | (9) |  | (9) |  | (527)
Twelve Months or Greater, Gross Unrealized Losses | 0 |  | 0 |  | 0
Total, Gross Unrealized Losses | (9) |  | (9) |  | (527)
U.S. Treasury Securities [Member] |  |  |  |  |
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |  |  |
Amortized Cost | 5,013 |  | 5,013 |  | 10,103
Gross Unrealized Gains | 7 |  | 7 |  | 0
Gross Unrealized Losses | 0 |  | 0 |  | (21)
Fair Value | 5,020 |  | 5,020 |  | 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 | 99,557 |  | 99,557 |  | 99,856
Gross Unrealized Gains | 2,702 |  | 2,702 |  | 3,080
Gross Unrealized Losses | (37) |  | (37) |  | (73)
Fair Value | 102,222 |  | 102,222 |  | 102,863
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than Twelve Months, Fair Value | 9,244 |  | 9,244 |  | 7,023
Twelve Months or Greater, Fair Value | 0 |  | 0 |  | 2,914
Total, Fair Value | 9,244 |  | 9,244 |  | 9,937
Less than Twelve Months, Gross Unrealized Losses | (37) |  | (37) |  | (57)
Twelve Months or Greater, Gross Unrealized Losses | 0 |  | 0 |  | (16)
Total, Gross Unrealized Losses | (37) |  | (37) |  | (73)
Corporate Obligations [Member] |  |  |  |  |
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |  |  |
Amortized Cost | 14,359 |  | 14,359 |  | 14,583
Gross Unrealized Gains | 17 |  | 17 |  | 68
Gross Unrealized Losses | 0 |  | 0 |  | (86)
Fair Value | 14,376 |  | 14,376 |  | 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 | 33,665 |  | 33,665 |  | 30,107
Gross Unrealized Gains | 420 |  | 420 |  | 186
Gross Unrealized Losses | (33) |  | (33) |  | (89)
Fair Value | 34,052 |  | 34,052 |  | 30,204
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than Twelve Months, Fair Value | 3,568 |  | 3,568 |  | 9,830
Twelve Months or Greater, Fair Value | 1,855 |  | 1,855 |  | 227
Total, Fair Value | 5,423 |  | 5,423 |  | 10,057
Less than Twelve Months, Gross Unrealized Losses | (18) |  | (18) |  | (77)
Twelve Months or Greater, Gross Unrealized Losses | (15) |  | (15) |  | (12)
Total, Gross Unrealized Losses | (33) |  | (33) |  | (89)
Equity Securities in Financial Institutions [Member] |  |  |  |  |
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |  |  |
Amortized Cost | 2,002 |  | 2,002 |  | 2,001
Gross Unrealized Gains | 716 |  | 716 |  | 436
Gross Unrealized Losses | 0 |  | 0 |  | (5)
Fair Value | $ 2,718 |  | $ 2,718 |  | 2,432
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |  |  |
Less than Twelve Months, Fair Value |  |  |  |  | 106
Twelve Months or Greater, Fair Value |  |  |  |  | 0
Total, Fair Value |  |  |  |  | 106
Less than Twelve Months, Gross Unrealized Losses |  |  |  |  | (5)
Twelve Months or Greater, Gross Unrealized Losses |  |  |  |  | 0
Total, Gross Unrealized Losses |  |  |  |  | $ (5)

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