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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Investments, Unrealized Loss Position [Line Items] |  |
Document Period End Date | Jun. 30, 2021 |
Less than 12 Months Fair Value | $ 1,281,858 | $ 426,607
Less than 12 Months Unrealized Loss | (14,442) | (2,402)
12 Months or More Fair Value | 82,951 | 117,126
12 Months or More Unrealized Loss | (224) | (2,989)
Total Fair Value | 1,364,809 | 543,733
Total Unrealized Loss | (14,666) | (5,391)
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 31,913 | 4,992
Less than 12 Months Unrealized Loss | (337) | (8)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 31,913 | 4,992
Total Unrealized Loss | (337) | (8)
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 175,728 | 84,749
Less than 12 Months Unrealized Loss | (528) | (435)
12 Months or More Fair Value | 25,449 | 68,967
12 Months or More Unrealized Loss | (110) | (391)
Total Fair Value | 201,177 | 153,716
Total Unrealized Loss | (638) | (826)
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 265,630 | 60,008
Less than 12 Months Unrealized Loss | (3,581) | (291)
12 Months or More Fair Value | 14,443 | 0
12 Months or More Unrealized Loss | (6) | 0
Total Fair Value | 280,073 | 60,008
Total Unrealized Loss | (3,587) | (291)
Collateralized Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 273,715 | 49,161
Less than 12 Months Unrealized Loss | (2,727) | (445)
12 Months or More Fair Value | 4,220 | 1
12 Months or More Unrealized Loss | (48) | 0
Total Fair Value | 277,935 | 49,162
Total Unrealized Loss | (2,775) | (445)
Commercial Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 69,725 | 169,825
Less than 12 Months Unrealized Loss | (507) | (986)
12 Months or More Fair Value | 38,839 | 48,158
12 Months or More Unrealized Loss | (60) | (2,598)
Total Fair Value | 108,564 | 217,983
Total Unrealized Loss | (567) | (3,584)
Residential Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 456,487 | 57,872
Less than 12 Months Unrealized Loss | (6,758) | (237)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 456,487 | 57,872
Total Unrealized Loss | (6,758) | (237)
Securities of U.S. government agencies and corporations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 8,660 | 0
Less than 12 Months Unrealized Loss | (4) | 0
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 8,660 | 0
Total Unrealized Loss | (4) | 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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