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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 | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 shares | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stock repurchased during period (in USD per share) | $ / shares |  | $ 399.82 |  |  |
SBA-PPP Loan |  |  | $ 32,516,189 |  | $ 32,791,975
SBA-PPP |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Number of loans originated | loan |  |  | 12,000 |  |
Loans receivable, period increase |  |  | $ 1,200,000 |  |
SBA-PPP Loan |  |  | $ 1,100,000 |  |
Class A Common Stock |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stock repurchased during period (in shares) | shares |  | 117,700 |  | 813,090 |
Stock repurchased during period |  | $ 47,060 |  | $ 333,755 |
Stock repurchased during period (in USD per share) | $ / shares |  |  |  | $ 410.48 |
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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