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Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance $ (1,252,004)  
Other comprehensive income (loss), net of tax 122,793 $ (157,064)
Ending Balance (1,129,211)  
Securities Available For Sale [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (1,230,828) (1,094,794)
Other comprehensive income (loss) before reclassifications 122,537 (157,394)
Reclassification of amounts included in net income 11 0
Other comprehensive income (loss), net of tax 122,548 (157,394)
Ending Balance (1,108,280) (1,252,188)
Defined Benefit Plans [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (21,176) (24,425)
Other comprehensive income (loss) before reclassifications 0 0
Reclassification of amounts included in net income 245 330
Other comprehensive income (loss), net of tax 245 330
Ending Balance (20,931) (24,095)
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (1,252,004) (1,119,219)
Other comprehensive income (loss) before reclassifications 122,537 (157,394)
Reclassification of amounts included in net income 256 330
Other comprehensive income (loss), net of tax 122,793 (157,064)
Ending Balance $ (1,129,211) $ (1,276,283)