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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Investments, Unrealized Loss Position [Line Items] |  |
Document Period End Date | Sep. 30, 2019 |
Less than 12 Months Fair Value | $ 388,421 | $ 961,572
Less than 12 Months Unrealized Loss | (1,090) | (6,345)
12 Months or More Fair Value | 184,455 | 882,865
12 Months or More Unrealized Loss | (3,732) | (23,557)
Total Fair Value | 572,876 | 1,844,437
Total Unrealized Loss | (4,822) | (29,902)
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 4,160 | 33,752
Less than 12 Months Unrealized Loss | (10) | (884)
12 Months or More Fair Value | 5,525 | 4,570
12 Months or More Unrealized Loss | (233) | (220)
Total Fair Value | 9,685 | 38,322
Total Unrealized Loss | (243) | (1,104)
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 259,681 | 336,437
Less than 12 Months Unrealized Loss | (824) | (2,312)
12 Months or More Fair Value | 40,776 | 37,105
12 Months or More Unrealized Loss | (283) | (498)
Total Fair Value | 300,457 | 373,542
Total Unrealized Loss | (1,107) | (2,810)
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 14,202 | 62,805
Less than 12 Months Unrealized Loss | (44) | (299)
12 Months or More Fair Value | 6,714 | 86,644
12 Months or More Unrealized Loss | (78) | (2,489)
Total Fair Value | 20,916 | 149,449
Total Unrealized Loss | (122) | (2,788)
Collateralized Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 43,732 | 194,795
Less than 12 Months Unrealized Loss | (107) | (1,546)
12 Months or More Fair Value | 29,908 | 240,514
12 Months or More Unrealized Loss | (219) | (5,245)
Total Fair Value | 73,640 | 435,309
Total Unrealized Loss | (326) | (6,791)
Commercial Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 52,281 | 147,754
Less than 12 Months Unrealized Loss | (60) | (369)
12 Months or More Fair Value | 89,681 | 232,363
12 Months or More Unrealized Loss | (2,820) | (7,597)
Total Fair Value | 141,962 | 380,117
Total Unrealized Loss | (2,880) | (7,966)
Residential Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 14,365 | 186,029
Less than 12 Months Unrealized Loss | (45) | (935)
12 Months or More Fair Value | 11,851 | 264,795
12 Months or More Unrealized Loss | (99) | (7,273)
Total Fair Value | 26,216 | 450,824
Total Unrealized Loss | (144) | (8,208)
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 | 16,777
12 Months or More Unrealized Loss | 0 | (233)
Total Fair Value | 0 | 16,777
Total Unrealized Loss | 0 | (233)
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)

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