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Investments (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) Security | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($)
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |
Amortized Cost | $ 366,920 |  | $ 356,399
Gross Unrealized Gains | 5,237 |  | 4,139
Gross Unrealized Losses | (232) |  | (801)
Fair Value | $ 371,925 |  | 359,737
Number of securities owned with fair value less than cost | Security | 44 |  |
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |
Less than Twelve Months, Fair Value | $ 57,705 |  | 156,454
Twelve Months or Greater, Fair Value | 5,266 |  | 5,279
Total, Fair Value | 62,971 |  | 161,733
Less than Twelve Months, Gross Unrealized Losses | (191) |  | (748)
Twelve Months or Greater, Gross Unrealized Losses | (41) |  | (53)
Total, Gross Unrealized Losses | $ (232) |  | (801)
Duration securities impaired, Minimum | 1 year |  |
Proceeds from sale of securities available-for-sale | $ 5,020 | $ 14,623 |
Realized investment gains (losses) [Abstract] |  |  |
Gross gains | 27 | 137 |
Gross losses | 0 | (11) |
Net gains | 27 | $ 126 |
Investment securities pledged as collateral | 221,900 |  | 203,800
Amortized Cost [Abstract] |  |  |
Due in one year or less | 37,238 |  |
Due after one year through five years | 198,445 |  |
Due after five years through ten years | 43,004 |  |
Due after ten years | 86,232 |  |
Total | 364,919 |  |
Fair Value [Abstract] |  |  |
Due in one year or less | 37,445 |  |
Due after one year through five years | 200,491 |  |
Due after five years through ten years | 43,960 |  |
Due after ten years | 87,688 |  |
Total | 369,584 |  |
U.S. Agency Securities [Member] |  |  |
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |
Amortized Cost | 212,978 |  | 199,749
Gross Unrealized Gains | 1,377 |  | 369
Gross Unrealized Losses | (36) |  | (527)
Fair Value | 214,319 |  | 199,591
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |
Less than Twelve Months, Fair Value | 34,231 |  | 123,591
Twelve Months or Greater, Fair Value | 0 |  | 0
Total, Fair Value | 34,231 |  | 123,591
Less than Twelve Months, Gross Unrealized Losses | (36) |  | (527)
Twelve Months or Greater, Gross Unrealized Losses | 0 |  | 0
Total, Gross Unrealized Losses | (36) |  | (527)
US Treasury Securities [Member] |  |  |
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |
Amortized Cost | 5,078 |  | 10,103
Gross Unrealized Gains | 4 |  | 0
Gross Unrealized Losses | 0 |  | (21)
Fair Value | 5,082 |  | 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 | 101,685 |  | 99,856
Gross Unrealized Gains | 3,089 |  | 3,080
Gross Unrealized Losses | (116) |  | (73)
Fair Value | 104,658 |  | 102,863
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |
Less than Twelve Months, Fair Value | 12,058 |  | 7,023
Twelve Months or Greater, Fair Value | 2,197 |  | 2,914
Total, Fair Value | 14,255 |  | 9,937
Less than Twelve Months, Gross Unrealized Losses | (96) |  | (57)
Twelve Months or Greater, Gross Unrealized Losses | (20) |  | (16)
Total, Gross Unrealized Losses | (116) |  | (73)
Corporate Obligations [Member] |  |  |
Available for Sale Securities Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value [Abstract] |  |  |
Amortized Cost | 12,503 |  | 14,583
Gross Unrealized Gains | 52 |  | 68
Gross Unrealized Losses | (19) |  | (86)
Fair Value | 12,536 |  | 14,565
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |
Less than Twelve Months, Fair Value | 4,257 |  | 5,822
Twelve Months or Greater, Fair Value | 2,140 |  | 2,138
Total, Fair Value | 6,397 |  | 7,960
Less than Twelve Months, Gross Unrealized Losses | (14) |  | (61)
Twelve Months or Greater, Gross Unrealized Losses | (5) |  | (25)
Total, Gross Unrealized Losses | (19) |  | (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 | 32,675 |  | 30,107
Gross Unrealized Gains | 351 |  | 186
Gross Unrealized Losses | (37) |  | (89)
Fair Value | 32,989 |  | 30,204
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |
Less than Twelve Months, Fair Value | 6,174 |  | 9,830
Twelve Months or Greater, Fair Value | 929 |  | 227
Total, Fair Value | 7,103 |  | 10,057
Less than Twelve Months, Gross Unrealized Losses | (21) |  | (77)
Twelve Months or Greater, Gross Unrealized Losses | (16) |  | (12)
Total, Gross Unrealized Losses | (37) |  | (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
Gross Unrealized Gains | 364 |  | 436
Gross Unrealized Losses | (24) |  | (5)
Fair Value | 2,341 |  | 2,432
Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] |  |  |
Less than Twelve Months, Fair Value | 985 |  | 106
Twelve Months or Greater, Fair Value | 0 |  | 0
Total, Fair Value | 985 |  | 106
Less than Twelve Months, Gross Unrealized Losses | (24) |  | (5)
Twelve Months or Greater, Gross Unrealized Losses | 0 |  | 0
Total, Gross Unrealized Losses | $ (24) |  | $ (5)

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