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Accumulated Other Comprehensive Income or Loss and Earnings Per Share (Components Of Other Comprehensive Income or Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Activity Accumulated Other Comprehensive Income [Roll Forward]        
Beginning balance $ 5,015,506 $ 4,492,256 $ 4,796,838 $ 4,498,688
Other comprehensive (loss) income during the period, net of tax, before reclassifications (116,970) (127,748) (58,949) (251,551)
Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax 10,336 742 12,547 4,485
Amount reclassified from accumulated other comprehensive income or loss related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax (20) (32) (52) (63)
Net other comprehensive (loss) income during the period, net of tax (106,654) (127,038) (46,454) (247,129)
Ending balance 5,041,912 4,727,623 5,041,912 4,727,623
Accumulated Unrealized (Losses) Gains on Securities        
Activity Accumulated Other Comprehensive Income [Roll Forward]        
Beginning balance (351,995) (142,604) (386,057) 8,724
Other comprehensive (loss) income during the period, net of tax, before reclassifications (33,909) (122,154) 594 (273,268)
Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax (1) 0 (410) (183)
Amount reclassified from accumulated other comprehensive income or loss related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax (20) (32) (52) (63)
Net other comprehensive (loss) income during the period, net of tax (33,930) (122,186) 132 (273,514)
Ending balance (385,925) (264,790) (385,925) (264,790)
Accumulated Unrealized Gains (Losses) on Derivative Instruments        
Activity Accumulated Other Comprehensive Income [Roll Forward]        
Beginning balance 32,809 56,060 7,381 27,111
Other comprehensive (loss) income during the period, net of tax, before reclassifications (88,405) 999 (65,597) 26,022
Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax 10,337 742 12,957 4,668
Amount reclassified from accumulated other comprehensive income or loss related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax 0 0 0 0
Net other comprehensive (loss) income during the period, net of tax (78,068) 1,741 (52,640) 30,690
Ending balance (45,259) 57,801 (45,259) 57,801
Accumulated Foreign Currency Translation Adjustments        
Activity Accumulated Other Comprehensive Income [Roll Forward]        
Beginning balance (48,250) (29,455) (48,960) (31,743)
Other comprehensive (loss) income during the period, net of tax, before reclassifications 5,344 (6,593) 6,054 (4,305)
Amount reclassified from accumulated other comprehensive income or loss into net income, net of tax 0 0 0 0
Amount reclassified from accumulated other comprehensive income or loss related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax 0 0 0 0
Net other comprehensive (loss) income during the period, net of tax 5,344 (6,593) 6,054 (4,305)
Ending balance (42,906) (36,048) (42,906) (36,048)
Accumulated other comprehensive income (loss)        
Activity Accumulated Other Comprehensive Income [Roll Forward]        
Beginning balance (367,436) (115,999) (427,636) 4,092
Ending balance $ (474,090) $ (243,037) $ (474,090) $ (243,037)