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DEBT SECURITIES - Debt securities in an unrealized loss position (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 1,070,674 | $ 2,676,734
12 months or more | 1,368,859 | 106,443
Total | 2,439,533 | 2,783,177
Unrealized Losses |  |
Less than 12 months | (81,841) | (49,847)
12 months or more | (229,363) | (4,807)
Total | (311,204) | (54,654)
Fair Value |  |
Less than 12 months | 58,065 |
12 months or more | 727,230 |
Total | 785,295 | 0
Unrealized Losses |  |
Less than 12 months | (8,009) |
12 months or more | (125,008) |
Total | (133,017) | 0
U.S. Treasury securities |  |
Fair Value |  |
Less than 12 months | 74 | 163,653
12 months or more | 113,987 | 0
Total | 114,061 | 163,653
Unrealized Losses |  |
Less than 12 months | 0 | (1,047)
12 months or more | (3,744) | 0
Total | (3,744) | (1,047)
Obligations of U.S. government corporations and agencies |  |
Fair Value |  |
Less than 12 months | 19,603 |
12 months or more | 0 |
Total | 19,603 |
Unrealized Losses |  |
Less than 12 months | (321) |
12 months or more | 0 |
Total | (321) |
Obligations of states and political subdivisions |  |
Fair Value |  |
Less than 12 months | 166,147 | 92,680
12 months or more | 75,217 | 0
Total | 241,364 | 92,680
Unrealized Losses |  |
Less than 12 months | (10,059) | (1,493)
12 months or more | (16,016) | 0
Total | (26,075) | (1,493)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months | 390,164 | 89,983
12 months or more | 79,711 | 0
Total | 469,875 | 89,983
Unrealized Losses |  |
Less than 12 months | (15,648) | (164)
12 months or more | (4,035) | 0
Total | (19,683) | (164)
Commercial mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 89,428 | 389,078
12 months or more | 18,966 | 85,905
Total | 108,394 | 474,983
Unrealized Losses |  |
Less than 12 months | (12,623) | (10,186)
12 months or more | (3,406) | (3,580)
Total | (16,029) | (13,766)
Fair Value |  |
Less than 12 months | 58,065 |
12 months or more | 353,017 |
Total | 411,082 |
Unrealized Losses |  |
Less than 12 months | (8,009) |
12 months or more | (55,729) |
Total | (63,738) |
Residential mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 366,221 | 1,700,187
12 months or more | 876,668 | 20,538
Total | 1,242,889 | 1,720,725
Unrealized Losses |  |
Less than 12 months | (38,111) | (33,453)
12 months or more | (182,606) | (1,227)
Total | (220,717) | (34,680)
Fair Value |  |
Less than 12 months | 0 |
12 months or more | 374,213 |
Total | 374,213 |
Unrealized Losses |  |
Less than 12 months | 0 |
12 months or more | (69,279) |
Total | (69,279) |
Corporate debt securities |  |
Fair Value |  |
Less than 12 months | 39,037 | 241,153
12 months or more | 204,310 | 0
Total | 243,347 | 241,153
Unrealized Losses |  |
Less than 12 months | (5,079) | (3,504)
12 months or more | (19,556) | 0
Total | $ (24,635) | $ (3,504)

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