Accounting Policies and Basis of Presentation - Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) vote State branch shares	Dec. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items]
Number of branches | branch	529
Number of states in which entity operates | State	19
Cash and cash equivalents	$ 9,030,000,000.00	$ 4,270,000,000
Non-marketable securities	9,600,000	11,600,000
FHLB restricted stock	40,500,000	45,400,000
Amortization Method Qualified Affordable Housing Project Investments	156,600,000	163,900,000
Financing receivable, allowance for credit loss, expected, COVID-19	0
Financing receivable, collateral dependent, threshold for loans individually evaluated for impairment	500,000
Reserve for unfunded commitments	$ 11,800,000
Useful life (years)	5 years 7 months 6 days
Increase (decrease) in allowance for credit loss	$ 178,493,000	224,314,000		$ 225,141,000	$ 223,712,000
Retained earnings	$ 4,377,712,000	$ 3,867,252,000
Cumulative Effect, Period of Adoption, Adjustment
Property, Plant and Equipment [Line Items]
Increase (decrease) in allowance for credit loss			$ 37,900,000	$ (37,924,000)
Visa Class B Common Stock
Property, Plant and Equipment [Line Items]
Investment owned (in shares) | shares	353,577
Investment owned, fair value	$ 0
Class A Common Stock, Par Value $1
Property, Plant and Equipment [Line Items]
Votes per share of common stock | vote	1
Class B Common Stock
Property, Plant and Equipment [Line Items]
Votes per share of common stock | vote	16
Minimum
Property, Plant and Equipment [Line Items]
Useful life (years)	5 years
Operating lease renewal term (years)	1 year
Maximum
Property, Plant and Equipment [Line Items]
Useful life (years)	12 years
Operating lease renewal term (years)	25 years