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Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income, Net of Tax) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | $ (1,119,219) |  |
Net other comprehensive income (loss) during period | (132,785) | $ 229,075 | $ (1,695,612)
Ending Balance | (1,252,004) | (1,119,219) |
Available-for-sale Securities [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | (1,094,794) | (1,313,791) | 380,209
Other comprehensive income (loss) before reclassification | (136,110) | 219,049 | (1,694,000)
Reclassification of amounts included in net income | 76 | (52) | 0
Net other comprehensive income (loss) during period | (136,034) | 218,997 | (1,694,000)
Ending Balance | (1,230,828) | (1,094,794) | (1,313,791)
Defined Benefit Plans [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | (24,425) | (34,503) | (32,891)
Other comprehensive income (loss) before reclassification | 1,927 | 7,330 | (3,954)
Reclassification of amounts included in net income | 1,322 | 2,748 | 2,342
Net other comprehensive income (loss) during period | 3,249 | 10,078 | (1,612)
Ending Balance | (21,176) | (24,425) | (34,503)
AOCI Attributable to Parent [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | (1,119,219) | (1,348,294) | 347,318
Other comprehensive income (loss) before reclassification | (134,183) | 226,379 | (1,697,954)
Reclassification of amounts included in net income | 1,398 | 2,696 | 2,342
Net other comprehensive income (loss) during period | (132,785) | 229,075 | (1,695,612)
Ending Balance | $ (1,252,004) | $ (1,119,219) | $ (1,348,294)

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