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Investments (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) Security | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |
Amortized Cost | $ 279,897 |  | $ 312,039
Gross Unrealized Gains | 2,734 |  | 3,087
Gross Unrealized Losses | (858) |  | (1,109)
Fair Value | $ 281,773 |  | 314,017
Number of securities owned with fair value less than cost | Security | 80 |  |
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |
Less than Twelve Months, Fair Value | $ 103,699 |  | 106,062
Twelve Months or Greater, Fair Value | 5,276 |  | 1,520
Total, Fair Value | 108,975 |  | 107,582
Less than Twelve Months, Gross Unrealized Losses | (763) |  | (1,071)
Twelve Months or Greater, Gross Unrealized Losses | (95) |  | (38)
Total, Gross Unrealized Losses | (858) |  | (1,109)
Proceeds from sale of securities available-for-sale | 18,766 | $ 5,020 |
Realized investment gains (losses) [Abstract] |  |  |
Gross gains | 172 | 27 |
Gross losses | 0 | 0 |
Net gains | 172 | $ 27 |
Investment securities pledged as collateral | 206,500 |  | 206,300
Available-for-Sale Debt Securities, Amortized Cost [Abstract] |  |  |
Due in one year or less | 36,081 |  |
Due after one year through five years | 141,531 |  |
Due after five years through ten years | 38,172 |  |
Due after ten years | 63,214 |  |
Total | 278,998 |  |
Available-for-Sale Debt Securities, Fair Value [Abstract] |  |  |
Due in one year or less | 36,288 |  |
Due after one year through five years | 142,341 |  |
Due after five years through ten years | 38,283 |  |
Due after ten years | 63,202 |  |
Total | $ 280,114 |  |
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 | $ 147,624 |  | 170,276
Gross Unrealized Gains | 297 |  | 407
Gross Unrealized Losses | (263) |  | (269)
Fair Value | 147,658 |  | 170,414
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |
Less than Twelve Months, Fair Value | 61,938 |  | 50,947
Twelve Months or Greater, Fair Value | 0 |  | 0
Total, Fair Value | 61,938 |  | 50,947
Less than Twelve Months, Gross Unrealized Losses | (263) |  | (269)
Twelve Months or Greater, Gross Unrealized Losses | 0 |  | 0
Total, Gross Unrealized Losses | (263) |  | (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 | 87,082 |  | 95,956
Gross Unrealized Gains | 1,500 |  | 1,463
Gross Unrealized Losses | (339) |  | (493)
Fair Value | 88,243 |  | 96,926
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |
Less than Twelve Months, Fair Value | 18,733 |  | 28,398
Twelve Months or Greater, Fair Value | 2,117 |  | 767
Total, Fair Value | 20,850 |  | 29,165
Less than Twelve Months, Gross Unrealized Losses | (279) |  | (472)
Twelve Months or Greater, Gross Unrealized Losses | (60) |  | (21)
Total, Gross Unrealized Losses | (339) |  | (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
Gross Unrealized Gains | 95 |  | 50
Gross Unrealized Losses | 0 |  | 0
Fair Value | 3,095 |  | 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 | 41,292 |  | 37,987
Gross Unrealized Gains | 82 |  | 88
Gross Unrealized Losses | (256) |  | (347)
Fair Value | 41,118 |  | 37,728
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |
Less than Twelve Months, Fair Value | 23,028 |  | 26,717
Twelve Months or Greater, Fair Value | 3,159 |  | 753
Total, Fair Value | 26,187 |  | 27,470
Less than Twelve Months, Gross Unrealized Losses | (221) |  | (330)
Twelve Months or Greater, Gross Unrealized Losses | (35) |  | (17)
Total, Gross Unrealized Losses | (256) |  | (347)
Equity Securities in Financial Institutions [Member] |  |  |
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |
Amortized Cost | 899 |  | 1,821
Gross Unrealized Gains | 760 |  | 1,078
Gross Unrealized Losses | 0 |  | 0
Fair Value | $ 1,659 |  | $ 2,899

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