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Basis of Presentation and Summary of Significant Accounting Policies - Effects of Reclassifications out of Accumulated Other Comprehensive Earnings (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |
Earnings before income taxes | $ 157,245 |  |  | $ 116,825 |  |  | $ 392,391 | $ 380,119
Income tax (expense) benefit | (32,635) |  |  | (21,798) |  |  | (80,231) | (75,200)
Net earnings | 124,610 | $ 124,336 | $ 63,214 | 95,027 | $ 81,992 | $ 127,900 | 312,160 | 304,919
Unrealized Gains and Losses on Available-for-Sale Securities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |
Net realized gains (losses) - Available-for-sale | 2,878 |  |  | (1,365) |  |  | 1,775 | (3,129)
Credit gains (losses) presented within net realized gains | (654) |  |  | (6) |  |  | (702) | 72
Earnings before income taxes | 2,224 |  |  | (1,371) |  |  | 1,073 | (3,057)
Income tax (expense) benefit | (467) |  |  | 288 |  |  | (225) | 642
Net earnings | $ 1,757 |  |  | $ (1,083) |  |  | $ 848 | $ (2,415)

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