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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, 2021 | Dec. 31, 2020
Investments, Unrealized Loss Position [Line Items] |  |
Document Period End Date | Sep. 30, 2021 |
Less than 12 Months Fair Value | $ 1,418,947 | $ 426,607
Less than 12 Months Unrealized Loss | (20,254) | (2,402)
12 Months or More Fair Value | 87,340 | 117,126
12 Months or More Unrealized Loss | (1,025) | (2,989)
Total Fair Value | 1,506,287 | 543,733
Total Unrealized Loss | (21,279) | (5,391)
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 43,960 | 4,992
Less than 12 Months Unrealized Loss | (540) | (8)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 43,960 | 4,992
Total Unrealized Loss | (540) | (8)
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 111,942 | 84,749
Less than 12 Months Unrealized Loss | (770) | (435)
12 Months or More Fair Value | 16,462 | 68,967
12 Months or More Unrealized Loss | (38) | (391)
Total Fair Value | 128,404 | 153,716
Total Unrealized Loss | (808) | (826)
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 391,674 | 60,008
Less than 12 Months Unrealized Loss | (8,725) | (291)
12 Months or More Fair Value | 19,537 | 0
12 Months or More Unrealized Loss | (154) | 0
Total Fair Value | 411,211 | 60,008
Total Unrealized Loss | (8,879) | (291)
Collateralized Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 309,109 | 49,161
Less than 12 Months Unrealized Loss | (2,975) | (445)
12 Months or More Fair Value | 18,819 | 1
12 Months or More Unrealized Loss | (466) | 0
Total Fair Value | 327,928 | 49,162
Total Unrealized Loss | (3,441) | (445)
Commercial Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 121,782 | 169,825
Less than 12 Months Unrealized Loss | (1,140) | (986)
12 Months or More Fair Value | 18,671 | 48,158
12 Months or More Unrealized Loss | (96) | (2,598)
Total Fair Value | 140,453 | 217,983
Total Unrealized Loss | (1,236) | (3,584)
Residential Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 423,116 | 57,872
Less than 12 Months Unrealized Loss | (6,029) | (237)
12 Months or More Fair Value | 13,851 | 0
12 Months or More Unrealized Loss | (271) | 0
Total Fair Value | 436,967 | 57,872
Total Unrealized Loss | (6,300) | (237)
Securities of U.S. government agencies and corporations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 17,364 | 0
Less than 12 Months Unrealized Loss | (75) | 0
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 17,364 | 0
Total Unrealized Loss | (75) | 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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