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Investments - Unrealized losses (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Mar. 31, 2016
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | $ 186,052 | $ 100,566
Less than 12 Months, Unrealized Losses | (1,530) | (504)
12 Months or More, Fair Value | 20,188 | 20,635
12 Months or More, Unrealized Losses | (402) | (310)
Total Fair Value | 206,240 | 121,201
Total Unrealized Losses | (1,932) | (814)
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 21,348 | 10,899
Less than 12 Months, Unrealized Losses | (125) | (56)
12 Months or More, Fair Value | 3,954 | 3,785
12 Months or More, Unrealized Losses | (92) | (79)
Total Fair Value | 25,302 | 14,684
Total Unrealized Losses | (217) | (135)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 40,016 | 9,791
Less than 12 Months, Unrealized Losses | (296) | (82)
12 Months or More, Fair Value | 0 | 4,319
12 Months or More, Unrealized Losses | 0 | (14)
Total Fair Value | 40,016 | 14,110
Total Unrealized Losses | (296) | (96)
Held-to-maturity Securities |  |
Less than 12 Months, Fair Value | 1,053 |
Less than 12 Months, Unrealized Losses | (1) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Total Fair Value | 1,053 |
Total Unrealized Losses | (1) |
U.S. Government agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 124,688 | 79,876
Less than 12 Months, Unrealized Losses | (1,109) | (366)
12 Months or More, Fair Value | 16,234 | 12,531
12 Months or More, Unrealized Losses | (310) | (217)
Total Fair Value | 140,922 | 92,407
Total Unrealized Losses | $ (1,419) | $ (583)

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