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Supplemental Information about Changes to Accumulated Other Comprehensive Income - Schedule of Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Unrealized investment (gains) losses on available for sale assets: |  |  |  |
Realized (gains) losses | $ 4,987 | $ 2,192 | $ 23,476 | $ 26,580
Amortization of (discount) premium | (286,013) | (284,964) | (848,796) | (853,178)
Other operating expense | 111,562 | 104,874 | 328,601 | 297,196
Total before tax | (477,102) | (376,958) | (1,106,482) | (1,014,204)
Tax | 89,259 | 73,964 | 211,327 | 198,638
Total after-tax | (387,843) | (302,994) | (895,155) | (815,566)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Unrealized investment (gains) losses on available for sale assets: |  |  |  |
Total after-tax | 7,897 | (1,810) | 13,734 | 2,318
Reclassification out of Accumulated Other Comprehensive Income | Unrealized investment (gains) losses on available for sale assets: |  |  |  |
Unrealized investment (gains) losses on available for sale assets: |  |  |  |
Realized (gains) losses | 11,746 | (257) | 23,755 | 9,732
Amortization of (discount) premium | (1,813) | (2,151) | (6,560) | (7,152)
Total before tax | 9,933 | (2,408) | 17,195 | 2,580
Tax | (2,086) | 505 | (3,611) | (542)
Total after-tax | 7,847 | (1,903) | 13,584 | 2,038
Reclassification out of Accumulated Other Comprehensive Income | Pension adjustments: |  |  |  |
Unrealized investment (gains) losses on available for sale assets: |  |  |  |
Total before tax | 64 | 118 | 191 | 354
Tax | (14) | (25) | (41) | (74)
Total after-tax | 50 | 93 | 150 | 280
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service cost |  |  |  |
Unrealized investment (gains) losses on available for sale assets: |  |  |  |
Other operating expense | 292 | 265 | 876 | 803
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial (gain) loss |  |  |  |
Unrealized investment (gains) losses on available for sale assets: |  |  |  |
Other operating expense | $ (228) | $ (147) | $ (685) | $ (449)

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