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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, 2022 | Dec. 31, 2021
Investments, Unrealized Loss Position [Line Items] |  |
Document Period End Date | Jun. 30, 2022 |
Less than 12 Months Fair Value | $ 3,127,669 | $ 1,970,822
Less than 12 Months Unrealized Loss | (222,238) | (27,427)
12 Months or More Fair Value | 490,322 | 171,838
12 Months or More Unrealized Loss | (70,326) | (4,187)
Total Fair Value | 3,617,991 | 2,142,660
Total Unrealized Loss | (292,564) | (31,614)
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 116,117 | 31,896
Less than 12 Months Unrealized Loss | (3,883) | (354)
12 Months or More Fair Value | 11,744 | 11,877
12 Months or More Unrealized Loss | (507) | (373)
Total Fair Value | 127,861 | 43,773
Total Unrealized Loss | (4,390) | (727)
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 714,112 | 482,118
Less than 12 Months Unrealized Loss | (39,664) | (2,578)
12 Months or More Fair Value | 25,917 | 0
12 Months or More Unrealized Loss | (2,388) | 0
Total Fair Value | 740,029 | 482,118
Total Unrealized Loss | (42,052) | (2,578)
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 626,316 | 380,735
Less than 12 Months Unrealized Loss | (67,853) | (7,543)
12 Months or More Fair Value | 126,912 | 55,568
12 Months or More Unrealized Loss | (20,513) | (1,051)
Total Fair Value | 753,228 | 436,303
Total Unrealized Loss | (88,366) | (8,594)
Collateralized Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 429,951 | 369,318
Less than 12 Months Unrealized Loss | (29,304) | (6,110)
12 Months or More Fair Value | 73,602 | 12,485
12 Months or More Unrealized Loss | (11,228) | (387)
Total Fair Value | 503,553 | 381,803
Total Unrealized Loss | (40,532) | (6,497)
Commercial Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 737,115 | 205,520
Less than 12 Months Unrealized Loss | (30,907) | (2,149)
12 Months or More Fair Value | 27,765 | 13,818
12 Months or More Unrealized Loss | (3,361) | (203)
Total Fair Value | 764,880 | 219,338
Total Unrealized Loss | (34,268) | (2,352)
Residential Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 400,570 | 459,098
Less than 12 Months Unrealized Loss | (37,708) | (8,375)
12 Months or More Fair Value | 224,382 | 78,090
12 Months or More Unrealized Loss | (32,329) | (2,173)
Total Fair Value | 624,952 | 537,188
Total Unrealized Loss | (70,037) | (10,548)
Securities of U.S. government agencies and corporations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 70,108 | 17,382
Less than 12 Months Unrealized Loss | (9,576) | (128)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 70,108 | 17,382
Total Unrealized Loss | (9,576) | (128)
U.S. Treasuries |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 33,380 | 24,755
Less than 12 Months Unrealized Loss | (3,343) | (190)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 33,380 | 24,755
Total Unrealized Loss | $ (3,343) | $ (190)

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