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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) loan | Jun. 30, 2020 USD ($) $ / shares shares | Dec. 31, 2020 shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Stock repurchased during period (in USD per share) | $ / shares | $ 367.03 |  |  |
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 |  |
Loans and leases, not acquired in a transfer accounted for as debt securities |  | $ 1,700,000 |  |
Class A Common Stock |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Stock repurchased during period (in shares) | shares | 346,000 |  | 695,390 |
Stock repurchased during period | $ 126,991 |  | $ 286,695 |
Stock repurchased during period (in USD per share) | $ / shares |  |  | $ 412.28 |
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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