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Accounting Policies and Basis of Presentation - Summary of Significant Accounting Policies (Details) shares in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) branch vote reportablesegment state | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Number of branches | branch | 542 |  |  |  |
Number of states in which entity operates | state | 19 |  |  |  |
Number of reportable segments | reportablesegment | 1 |  |  |  |
Non-marketable securities | $ 11,600,000 |  | $ 12,500,000 |  |
FHLB restricted stock | 45,400,000 |  | 43,000,000.0 |  |
Amortization Method Qualified Affordable Housing Project Investments | $ 163,900,000 |  | 167,800,000 |  |
Allowance for credit loss, forecast period | 2 years |  |  |  |
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 | 12,800,000 |  |  |  |
Goodwill, impairment loss | 0 |  |  |  |
Increase (decrease) in allowance for credit loss | 224,314,000 |  | 225,141,000 | $ 223,712,000 | $ 221,893,000
Retained earnings | 3,867,252,000 |  | 3,658,197,000 |  |
Debt securities, held-to-maturity, allowance for credit loss | 0 |  |  |  |
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) |  |
Cumulative Effect, Period of Adoption, Adjustment | Cumulative effect of adoption of ASC 326 |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Reserve for unfunded commitments |  | 8,900,000 |  |  |
Increase (decrease) in allowance for credit loss |  | (37,900,000) |  |  |
Retained earnings |  | 36,900,000 |  |  |
Debt securities, held-to-maturity, allowance for credit loss |  | 0 |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Cumulative effect of adoption of ASC 326 | Non-PCD Loans |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Increase (decrease) in allowance for credit loss |  | (56,900,000) |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Cumulative effect of adoption of ASC 326 | PCD Loans |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Increase (decrease) in allowance for credit loss |  | $ 19,000,000.0 |  |  |
Visa Class B Common Stock |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Investment owned (in shares) | shares |  |  | 354 |  |
Investment owned, fair value |  |  | $ 0 |  |
Held-to-maturity Securities |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Allowance for credit loss, expected | $ 0 |  |  |  |
Class A Common Stock |  |  |  |  |
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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