Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Reclassifications out of accumulated other comprehensive income, net of tax
Provision for income taxes	$ 33,160	$ 38,035	$ 106,751	$ 98,060
Net income	$ 124,144	133,043	387,517	352,547
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Reclassifications out of accumulated other comprehensive income, net of tax
Net income		(23)	(33)	(23)
Unrealized Gains and (Losses) on Securities Available for Sale | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Reclassifications out of accumulated other comprehensive income, net of tax
Securities gains (losses), net		(30)	(45)	(30)
Provision for income taxes		7	12	7
Net income		$ (23)	$ (33)	$ (23)