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Investments - Unrealized losses (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | $ 106,827 | $ 80,631
Less than 12 Months, Unrealized Losses | (1,283) | (702)
12 Months or More, Fair Value | 23,237 | 48,027
12 Months or More, Unrealized Losses | (384) | (645)
Total Fair Value | 130,064 | 128,658
Total Unrealized Losses | (1,667) | (1,347)
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 14,470 | 10,950
Less than 12 Months, Unrealized Losses | (27) | (193)
12 Months or More, Fair Value | 4,797 | 1,737
12 Months or More, Unrealized Losses | (115) | (50)
Total Fair Value | 19,267 | 12,687
Total Unrealized Losses | (142) | (243)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 67,406 | 16,776
Less than 12 Months, Unrealized Losses | (1,117) | (89)
12 Months or More, Fair Value | 0 | 15,290
12 Months or More, Unrealized Losses | 0 | (225)
Total Fair Value | 67,406 | 32,066
Total Unrealized Losses | (1,117) | (314)
Held-to-maturity Securities |  |
Less than 12 Months, Fair Value | 1,048 | 1,067
Less than 12 Months, Unrealized Losses | (11) | (6)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Total Fair Value | 1,048 | 1,067
Total Unrealized Losses | (11) | (6)
U.S. Government agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 24,951 | 52,905
Less than 12 Months, Unrealized Losses | (139) | (420)
12 Months or More, Fair Value | 18,440 | 31,000
12 Months or More, Unrealized Losses | (269) | (370)
Total Fair Value | 43,391 | 83,905
Total Unrealized Losses | $ (408) | $ (790)

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