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Debt Securities - Debt securities in an unrealized loss position (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 1,393,540 | $ 2,676,734
12 months or more | 1,139,006 | 106,443
Total | 2,532,546 | 2,783,177
Unrealized Losses |  |
Less than 12 months | (133,067) | (49,847)
Unrealized Losses | (195,800) | (4,807)
Total | (328,867) | (54,654)
Fair Value |  |
Less than 12 months | 271,660 |
12 months or more | 537,225 |
Total | 808,885 | 0
Unrealized Losses |  |
Less than 12 months | (44,835) |
12 months or more | (82,608) |
Total | (127,443) | 0
U.S. Treasury securities |  |
Fair Value |  |
Less than 12 months | 2,067 | 163,653
12 months or more | 138,775 | 0
Total | 140,842 | 163,653
Unrealized Losses |  |
Less than 12 months | (5) | (1,047)
Unrealized Losses | (4,648) | 0
Total | (4,653) | (1,047)
Obligations of U.S. government corporations and agencies |  |
Fair Value |  |
Less than 12 months | 21,629 |
12 months or more | 0 |
Total | 21,629 |
Unrealized Losses |  |
Less than 12 months | (358) |
Unrealized Losses | 0 |
Total | (358) |
Obligations of states and political subdivisions |  |
Fair Value |  |
Less than 12 months | 220,960 | 92,680
12 months or more | 41,779 | 0
Total | 262,739 | 92,680
Unrealized Losses |  |
Less than 12 months | (20,029) | (1,493)
Unrealized Losses | (7,824) | 0
Total | (27,853) | (1,493)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months | 441,896 | 89,983
12 months or more | 24,628 | 0
Total | 466,524 | 89,983
Unrealized Losses |  |
Less than 12 months | (21,681) | (164)
Unrealized Losses | (1,871) | 0
Total | (23,552) | (164)
Commercial mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 74,334 | 389,078
12 months or more | 13,417 | 85,905
Total | 87,751 | 474,983
Unrealized Losses |  |
Less than 12 months | (8,761) | (10,186)
Unrealized Losses | (2,207) | (3,580)
Total | (10,968) | (13,766)
Fair Value |  |
Less than 12 months | 109,085 |
12 months or more | 316,690 |
Total | 425,775 |
Unrealized Losses |  |
Less than 12 months | (15,592) |
12 months or more | (44,749) |
Total | (60,341) |
Residential mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 557,046 | 1,700,187
12 months or more | 747,141 | 20,538
Total | 1,304,187 | 1,720,725
Unrealized Losses |  |
Less than 12 months | (72,807) | (33,453)
Unrealized Losses | (161,188) | (1,227)
Total | (233,995) | (34,680)
Fair Value |  |
Less than 12 months | 162,575 |
12 months or more | 220,535 |
Total | 383,110 |
Unrealized Losses |  |
Less than 12 months | (29,243) |
12 months or more | (37,859) |
Total | (67,102) |
Corporate debt securities |  |
Fair Value |  |
Less than 12 months | 75,608 | 241,153
12 months or more | 173,266 | 0
Total | 248,874 | 241,153
Unrealized Losses |  |
Less than 12 months | (9,426) | (3,504)
Unrealized Losses | (18,062) | 0
Total | $ (27,488) | $ (3,504)

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