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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | $ 404,445 | $ 961,572
Less than 12 Months Unrealized Loss | (1,276) | (6,345)
12 Months or More Fair Value | 426,899 | 882,865
12 Months or More Unrealized Loss | (6,261) | (23,557)
Total Fair Value | 831,344 | 1,844,437
Total Unrealized Loss | (7,537) | (29,902)
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 | 97
12 Months or More Unrealized Loss | 0 | (2)
Total Fair Value | 0 | 97
Total Unrealized Loss | 0 | (2)
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 | 8,985 | 16,777
12 Months or More Unrealized Loss | (139) | (233)
Total Fair Value | 8,985 | 16,777
Total Unrealized Loss | (139) | (233)
Residential Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 10,507 | 186,029
Less than 12 Months Unrealized Loss | (67) | (935)
12 Months or More Fair Value | 131,539 | 264,795
12 Months or More Unrealized Loss | (1,288) | (7,273)
Total Fair Value | 142,046 | 450,824
Total Unrealized Loss | (1,355) | (8,208)
Commercial Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 99,535 | 147,754
Less than 12 Months Unrealized Loss | (197) | (369)
12 Months or More Fair Value | 91,179 | 232,363
12 Months or More Unrealized Loss | (2,939) | (7,597)
Total Fair Value | 190,714 | 380,117
Total Unrealized Loss | (3,136) | (7,966)
Collateralized Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 50,381 | 194,795
Less than 12 Months Unrealized Loss | (103) | (1,546)
12 Months or More Fair Value | 94,939 | 240,514
12 Months or More Unrealized Loss | (609) | (5,245)
Total Fair Value | 145,320 | 435,309
Total Unrealized Loss | (712) | (6,791)
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 19,676 | 62,805
Less than 12 Months Unrealized Loss | (38) | (299)
12 Months or More Fair Value | 14,123 | 86,644
12 Months or More Unrealized Loss | (183) | (2,489)
Total Fair Value | 33,799 | 149,449
Total Unrealized Loss | (221) | (2,788)
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 218,191 | 336,437
Less than 12 Months Unrealized Loss | (829) | (2,312)
12 Months or More Fair Value | 80,710 | 37,105
12 Months or More Unrealized Loss | (776) | (498)
Total Fair Value | 298,901 | 373,542
Total Unrealized Loss | (1,605) | (2,810)
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 6,155 | 33,752
Less than 12 Months Unrealized Loss | (42) | (884)
12 Months or More Fair Value | 5,424 | 4,570
12 Months or More Unrealized Loss | (327) | (220)
Total Fair Value | 11,579 | 38,322
Total Unrealized Loss | $ (369) | $ (1,104)

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