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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Investments, Unrealized Loss Position [Line Items] |  |
Document Period End Date | Dec. 31, 2021 |
Less than 12 Months Fair Value | $ 1,970,822 | $ 426,607
Less than 12 Months Unrealized Loss | (27,427) | (2,402)
12 Months or More Fair Value | 171,838 | 117,126
12 Months or More Unrealized Loss | (4,187) | (2,989)
Total Fair Value | 2,142,660 | 543,733
Total Unrealized Loss | (31,614) | (5,391)
U.S. Treasuries |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 24,755 | 0
Less than 12 Months Unrealized Loss | (190) | 0
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 24,755 | 0
Total Unrealized Loss | (190) | 0
Securities of U.S. government agencies and corporations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 17,382 | 0
Less than 12 Months Unrealized Loss | (128) | 0
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 17,382 | 0
Total Unrealized Loss | (128) | 0
Mortgage-backed securities-residential |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 459,098 | 57,872
Less than 12 Months Unrealized Loss | (8,375) | (237)
12 Months or More Fair Value | 78,090 | 0
12 Months or More Unrealized Loss | (2,173) | 0
Total Fair Value | 537,188 | 57,872
Total Unrealized Loss | (10,548) | (237)
Mortgage-backed securities-commercial |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 205,520 | 169,825
Less than 12 Months Unrealized Loss | (2,149) | (986)
12 Months or More Fair Value | 13,818 | 48,158
12 Months or More Unrealized Loss | (203) | (2,598)
Total Fair Value | 219,338 | 217,983
Total Unrealized Loss | (2,352) | (3,584)
Collateralized mortgage obligations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 369,318 | 49,161
Less than 12 Months Unrealized Loss | (6,110) | (445)
12 Months or More Fair Value | 12,485 | 1
12 Months or More Unrealized Loss | (387) | 0
Total Fair Value | 381,803 | 49,162
Total Unrealized Loss | (6,497) | (445)
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 380,735 | 60,008
Less than 12 Months Unrealized Loss | (7,543) | (291)
12 Months or More Fair Value | 55,568 | 0
12 Months or More Unrealized Loss | (1,051) | 0
Total Fair Value | 436,303 | 60,008
Total Unrealized Loss | (8,594) | (291)
Asset-backed Securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 482,118 | 84,749
Less than 12 Months Unrealized Loss | (2,578) | (435)
12 Months or More Fair Value | 0 | 68,967
12 Months or More Unrealized Loss | 0 | (391)
Total Fair Value | 482,118 | 153,716
Total Unrealized Loss | (2,578) | (826)
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 31,896 | 4,992
Less than 12 Months Unrealized Loss | (354) | (8)
12 Months or More Fair Value | 11,877 | 0
12 Months or More Unrealized Loss | (373) | 0
Total Fair Value | 43,773 | 4,992
Total Unrealized Loss | $ (727) | $ (8)

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