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Investments - Unrealized losses (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | $ 288,125 | $ 180,744
Less than 12 Months, Unrealized Losses | (6,354) | (2,148)
12 Months or More, Fair Value | 78,254 | 74,586
12 Months or More, Unrealized Losses | (4,254) | (2,195)
Total Fair Value | 366,379 | 255,330
Total Unrealized Losses | (10,608) | (4,343)
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 32,692 |
Less than 12 Months, Unrealized Losses | (49) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Total Fair Value | 32,692 |
Total Unrealized Losses | (49) |
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 7,103 | 8,201
Less than 12 Months, Unrealized Losses | (125) | (47)
12 Months or More, Fair Value | 0 | 6,741
12 Months or More, Unrealized Losses | 0 | (27)
Total Fair Value | 7,103 | 14,942
Total Unrealized Losses | (125) | (74)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 46,501 | 1,627
Less than 12 Months, Unrealized Losses | (687) | (3)
12 Months or More, Fair Value | 3,284 | 3,357
12 Months or More, Unrealized Losses | (141) | (87)
Total Fair Value | 49,785 | 4,984
Total Unrealized Losses | (828) | (90)
U.S. Government agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 144,623 | 82,604
Less than 12 Months, Unrealized Losses | (2,945) | (822)
12 Months or More, Fair Value | 44,649 | 64,488
12 Months or More, Unrealized Losses | (2,693) | (2,081)
Total Fair Value | 189,272 | 147,092
Total Unrealized Losses | (5,638) | (2,903)
Private label mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 57,206 | 88,312
Less than 12 Months, Unrealized Losses | (2,548) | (1,276)
12 Months or More, Fair Value | 30,321 | 0
12 Months or More, Unrealized Losses | (1,420) | 0
Total Fair Value | 87,527 | 88,312
Total Unrealized Losses | $ (3,968) | $ (1,276)

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