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Comprehensive Income/(Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 3,819,220 $ 2,544,279 $ 2,790,281 $ 2,533,062
Amounts reclassified from accumulated other comprehensive income/(loss) (389) (135) (967) (373)
Total other comprehensive income 24,975 53,404 69,963 44,889
Ending Balance 4,116,527 2,801,585 4,116,527 2,801,585
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     5,124 6,515
Other comprehensive income before reclassifications     0 0
Amounts reclassified from accumulated other comprehensive income/(loss) (141) (77) (416) (207)
Total other comprehensive income     (416) (207)
Ending Balance 4,708 6,308 4,708 6,308
Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (223,756) (233,208)
Other comprehensive income before reclassifications     70,930 45,262
Amounts reclassified from accumulated other comprehensive income/(loss) (248) (58) (551) (166)
Total other comprehensive income     70,379 45,096
Ending Balance (153,377) (188,112) (153,377) (188,112)
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (173,644) (235,208) (218,632) (226,693)
Other comprehensive income before reclassifications     70,930 45,262
Amounts reclassified from accumulated other comprehensive income/(loss)     (967) (373)
Total other comprehensive income 24,975 53,404 69,963 44,889
Ending Balance $ (148,669) $ (181,804) $ (148,669) $ (181,804)