Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Reclassifications out of accumulated other comprehensive income, net of tax
Interest expense	$ (16,601)	$ (11,463)	$ (36,971)	$ (42,352)
Salaries and employee benefits	(139,554)	(136,969)	(414,264)	(414,709)
Provision for income taxes	(38,035)	(30,821)	(98,060)	(100,464)
Net income	133,043	122,788	352,547	368,697
Amount Reclassified from Accumulated Other Comprehensive Loss
Reclassifications out of accumulated other comprehensive income, net of tax
Net income	(23)	(49)	(23)	(76)
Unrealized Gains and (Losses) on Securities Available for Sale | Amount Reclassified from Accumulated Other Comprehensive Loss
Reclassifications out of accumulated other comprehensive income, net of tax
Securities gains (losses), net	(30)	(64)	(30)	(100)
Provision for income taxes	7	15	7	24
Net income	$ (23)	$ (49)	$ (23)	$ (76)