Qualifying Debt Supplemental Schedule - Adoption of ASU 2016-01 (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncement, Early Adoption [Line Items]
Accumulated other comprehensive income	$ 15,700	$ 92,300	$ 25,000	$ (33,600)
Retained earnings	2,773,000	2,001,400
Non-interest income	404,200	70,800	65,100
Income tax expense	223,800	115,900	105,000
Net Income (Loss) Attributable to Parent	899,200	506,600	499,200
Net income available to common stockholders	$ 895,700	$ 506,600	$ 499,200
Basic	$ 8.72	$ 5.06	$ 4.86
Diluted	$ 8.67	$ 5.04	$ 4.84