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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)