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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 |  |  |  |

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