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Accounting Policies and Basis of Presentation Accounting Policies and Basis of Presentation (Recently Adopted Accounting Standards) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) loan $ / shares shares | Mar. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Stock issued (in shares) | shares |  | 339,958,000 |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.01 |  | $ 0.01 |
Stock repurchased during period (in shares) | shares |  | 349,390 |  |
Stock repurchased during period |  | $ 159,700 |  |
Stock repurchased during period (in USD per share) | $ / shares |  | $ 457.10 |  |
Forecast period (years) | 2 years |  |  |
Retained earnings | $ 4,005,318 |  | $ 3,867,252 |
Allowance for credit loss | 210,651 | $ 209,259 | 224,314 | $ 225,141
Commercial |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for credit loss | 74,864 | 72,410 | 80,842 | $ 142,369
Loans and leases, not acquired in a transfer accounted for as debt securities | $ 23,097,302 |  | 22,558,060 |
SBA-PPP |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Number of loans originated | loan | 9,600 |  |  |
Loans receivable, period increase | $ 1,100,000 |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | 2,800,000 |  |  |
SBA-PPP | Commercial |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans and leases, not acquired in a transfer accounted for as debt securities | $ 2,769,906 |  | $ 2,406,291 |
Class A Common Stock |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Stock repurchased during period |  | $ 159,704 |  |
Class A Common Stock | Repurchases From Ella Ann Holding |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Stock repurchased during period (in shares) | shares | 45,000 |  |  |

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