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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Investments, Unrealized Loss Position [Line Items] |  |
Document Period End Date | Mar. 31, 2020 |
Less than 12 Months Fair Value | $ 701,681 | $ 481,608
Less than 12 Months Unrealized Loss | (25,910) | (1,814)
12 Months or More Fair Value | 135,893 | 214,322
12 Months or More Unrealized Loss | (9,124) | (4,493)
Total Fair Value | 837,574 | 695,930
Total Unrealized Loss | (35,034) | (6,307)
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 46,746 | 0
Less than 12 Months Unrealized Loss | (3,081) | 0
12 Months or More Fair Value | 4,010 | 5,649
12 Months or More Unrealized Loss | (805) | (115)
Total Fair Value | 50,756 | 5,649
Total Unrealized Loss | (3,886) | (115)
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 279,980 | 125,889
Less than 12 Months Unrealized Loss | (16,048) | (553)
12 Months or More Fair Value | 59,852 | 54,963
12 Months or More Unrealized Loss | (2,793) | (511)
Total Fair Value | 339,832 | 180,852
Total Unrealized Loss | (18,841) | (1,064)
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 33,083 | 118,623
Less than 12 Months Unrealized Loss | (148) | (457)
12 Months or More Fair Value | 1,681 | 7,950
12 Months or More Unrealized Loss | (4) | (36)
Total Fair Value | 34,764 | 126,573
Total Unrealized Loss | (152) | (493)
Collateralized Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 115,697 | 85,248
Less than 12 Months Unrealized Loss | (1,847) | (297)
12 Months or More Fair Value | 8,267 | 30,628
12 Months or More Unrealized Loss | (632) | (196)
Total Fair Value | 123,964 | 115,876
Total Unrealized Loss | (2,479) | (493)
Commercial Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 188,990 | 111,658
Less than 12 Months Unrealized Loss | (4,567) | (298)
12 Months or More Fair Value | 62,083 | 104,069
12 Months or More Unrealized Loss | (4,890) | (3,571)
Total Fair Value | 251,073 | 215,727
Total Unrealized Loss | (9,457) | (3,869)
Residential Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 37,185 | 40,190
Less than 12 Months Unrealized Loss | (219) | (209)
12 Months or More Fair Value | 0 | 11,063
12 Months or More Unrealized Loss | 0 | (64)
Total Fair Value | 37,185 | 51,253
Total Unrealized Loss | (219) | (273)
Securities of U.S. government agencies and corporations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 0 | 0
Less than 12 Months Unrealized Loss | 0 | 0
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 0 | 0
Total Unrealized Loss | 0 | 0
U.S. Treasuries |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 0 | 0
Less than 12 Months Unrealized Loss | 0 | 0
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 0 | 0
Total Unrealized Loss | $ 0 | $ 0

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