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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, 2022 | Dec. 31, 2021
Investments, Unrealized Loss Position [Line Items] |  |
Document Period End Date | Mar. 31, 2022 |
Less than 12 Months Fair Value | $ 2,802,415 | $ 1,970,822
Less than 12 Months Unrealized Loss | (134,020) | (27,427)
12 Months or More Fair Value | 435,724 | 171,838
12 Months or More Unrealized Loss | (37,927) | (4,187)
Total Fair Value | 3,238,139 | 2,142,660
Total Unrealized Loss | (171,947) | (31,614)
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 98,897 | 31,896
Less than 12 Months Unrealized Loss | (2,103) | (354)
12 Months or More Fair Value | 11,569 | 11,877
12 Months or More Unrealized Loss | (681) | (373)
Total Fair Value | 110,466 | 43,773
Total Unrealized Loss | (2,784) | (727)
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 625,241 | 482,118
Less than 12 Months Unrealized Loss | (19,707) | (2,578)
12 Months or More Fair Value | 22,710 | 0
12 Months or More Unrealized Loss | (1,614) | 0
Total Fair Value | 647,951 | 482,118
Total Unrealized Loss | (21,321) | (2,578)
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 496,869 | 380,735
Less than 12 Months Unrealized Loss | (38,448) | (7,543)
12 Months or More Fair Value | 132,317 | 55,568
12 Months or More Unrealized Loss | (10,812) | (1,051)
Total Fair Value | 629,186 | 436,303
Total Unrealized Loss | (49,260) | (8,594)
Collateralized Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 449,683 | 369,318
Less than 12 Months Unrealized Loss | (22,616) | (6,110)
12 Months or More Fair Value | 52,838 | 12,485
12 Months or More Unrealized Loss | (5,333) | (387)
Total Fair Value | 502,521 | 381,803
Total Unrealized Loss | (27,949) | (6,497)
Commercial Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 636,688 | 205,520
Less than 12 Months Unrealized Loss | (16,831) | (2,149)
12 Months or More Fair Value | 28,585 | 13,818
12 Months or More Unrealized Loss | (2,475) | (203)
Total Fair Value | 665,273 | 219,338
Total Unrealized Loss | (19,306) | (2,352)
Residential Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 388,740 | 459,098
Less than 12 Months Unrealized Loss | (26,406) | (8,375)
12 Months or More Fair Value | 187,705 | 78,090
12 Months or More Unrealized Loss | (17,012) | (2,173)
Total Fair Value | 576,445 | 537,188
Total Unrealized Loss | (43,418) | (10,548)
Securities of U.S. government agencies and corporations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 73,673 | 17,382
Less than 12 Months Unrealized Loss | (5,665) | (128)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 73,673 | 17,382
Total Unrealized Loss | (5,665) | (128)
U.S. Treasuries |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 32,624 | 24,755
Less than 12 Months Unrealized Loss | (2,244) | (190)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 32,624 | 24,755
Total Unrealized Loss | $ (2,244) | $ (190)

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