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Fair Value Measurements - Assets and Liabilities Measured on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Jan. 01, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | --- | ---
Assets |  |  |  |  |  |  |  |
Investments in AFS debt securities |  | $ 197,367 |  |  |  |  |  |
Loans at fair value |  | 7,959,382 |  |  | $ 5,952,972 |  |  |
Servicing rights |  | 176,964 | $ 173,505 |  | 168,259 | $ 159,767 | $ 161,240 | $ 149,597
Derivative assets |  | 872 |  |  | 5,444 |  |  |
Digital assets safeguarding asset |  | 112,010 |  | $ 266,014 |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Residual interests classified as debt | [1] | 54,436 |  |  | 93,682 |  |  |
Derivative liabilities |  | 24,345 |  |  | 864 |  |  |
Digital assets safeguarding liability |  | 112,010 |  | $ 266,014 |  |  |  |
Carrying Value |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 707,302 |  |  | 494,711 |  |  |
Restricted cash and restricted cash equivalents |  | 291,631 |  |  | 273,726 |  |  |
Loans at amortized cost |  | 253,112 |  |  | 115,912 |  |  |
Total assets |  | 10,018,572 |  |  | 7,600,272 |  |  |
Liabilities |  |  |  |  |  |  |  |
Time deposits |  | 18,474 |  |  |  |  |  |
Debt |  | 3,723,561 |  |  | 3,947,983 |  |  |
Total liabilities |  | 3,934,451 |  |  | 4,042,529 |  |  |
Carrying Value | Fair Value, Recurring |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Investments in AFS debt securities |  | 197,933 |  |  | 194,907 |  |  |
Loans at fair value |  | 7,959,382 |  |  | 5,952,972 |  |  |
Servicing rights |  | 176,964 |  |  | 168,259 |  |  |
Derivative assets |  | 2,243 |  |  | 5,444 |  |  |
Digital assets safeguarding asset |  | 112,010 |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Derivative liabilities |  | 25,716 |  |  | 864 |  |  |
Digital assets safeguarding liability |  | 112,010 |  |  |  |  |  |
Carrying Value | Fair Value, Recurring | Asset-backed bonds |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Asset-backed bonds and residual investments |  | 193,739 |  |  | 253,669 |  |  |
Carrying Value | Fair Value, Recurring | Residual Investments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Asset-backed bonds and residual investments |  | 94,978 |  |  | 121,019 |  |  |
Carrying Value | Fair Value, Recurring | Non-securitization investments – ETFs |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Non-securitization investments |  |  |  |  | 1,486 |  |  |
Carrying Value | Fair Value, Recurring | Third-party warrants |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 766 |  |  | 1,369 |  |  |
Carrying Value | Fair Value, Recurring | Purchase price earn-out |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 625 |  |  | 4,272 |  |  |
Carrying Value | Fair Value, Recurring | Interest rate lock commitments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 1,120 |  |  | 3,759 |  |  |
Carrying Value | Fair Value, Recurring | Student loan commitments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Student loan commitments |  | 254 |  |  | 2,220 |  |  |
Carrying Value | Fair Value, Recurring | Interest rate caps |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 3,987 |  |  | 493 |  |  |
Carrying Value | Fair Value, Recurring | Residual interests classified as debt |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Residual interests classified as debt |  | 54,436 |  |  | 93,682 |  |  |
Carrying Value | Fair Value, Nonrecurring | Non-securitization investments - other |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Non-securitization investments |  | 22,780 |  |  | 6,054 |  |  |
Fair Value |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 707,302 |  |  | 494,711 |  |  |
Restricted cash and restricted cash equivalents |  | 291,631 |  |  | 273,726 |  |  |
Loans at amortized cost |  | 264,348 |  |  | 118,412 |  |  |
Total assets |  | 10,029,808 |  |  | 7,602,772 |  |  |
Liabilities |  |  |  |  |  |  |  |
Time deposits |  | 18,455 |  |  |  |  |  |
Debt |  | 3,339,606 |  |  | 4,047,813 |  |  |
Total liabilities |  | 3,550,477 |  |  | 4,142,359 |  |  |
Fair Value | Fair Value, Recurring |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Investments in AFS debt securities |  | 197,933 |  |  | 194,907 |  |  |
Loans at fair value |  | 7,959,382 |  |  | 5,952,972 |  |  |
Servicing rights |  | 176,964 |  |  | 168,259 |  |  |
Derivative assets |  | 2,243 |  |  | 5,444 |  |  |
Digital assets safeguarding asset |  | 112,010 |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Derivative liabilities |  | 25,716 |  |  | 864 |  |  |
Digital assets safeguarding liability |  | 112,010 |  |  |  |  |  |
Fair Value | Fair Value, Recurring | Asset-backed bonds |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Asset-backed bonds and residual investments |  | 193,739 |  |  | 253,669 |  |  |
Fair Value | Fair Value, Recurring | Residual Investments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Asset-backed bonds and residual investments |  | 94,978 |  |  | 121,019 |  |  |
Fair Value | Fair Value, Recurring | Non-securitization investments – ETFs |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Non-securitization investments |  |  |  |  | 1,486 |  |  |
Fair Value | Fair Value, Recurring | Third-party warrants |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 766 |  |  | 1,369 |  |  |
Fair Value | Fair Value, Recurring | Purchase price earn-out |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 625 |  |  | 4,272 |  |  |
Fair Value | Fair Value, Recurring | Interest rate lock commitments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 1,120 |  |  | 3,759 |  |  |
Fair Value | Fair Value, Recurring | Student loan commitments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Student loan commitments |  | 254 |  |  | 2,220 |  |  |
Fair Value | Fair Value, Recurring | Interest rate caps |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 3,987 |  |  | 493 |  |  |
Fair Value | Fair Value, Recurring | Residual interests classified as debt |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Residual interests classified as debt |  | 54,436 |  |  | 93,682 |  |  |
Fair Value | Fair Value, Nonrecurring | Non-securitization investments - other |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Non-securitization investments |  | 22,780 |  |  | 6,054 |  |  |
Level 1 |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 707,302 |  |  | 494,711 |  |  |
Restricted cash and restricted cash equivalents |  | 291,631 |  |  | 273,726 |  |  |
Loans at amortized cost |  | 0 |  |  | 0 |  |  |
Total assets |  | 1,138,564 |  |  | 899,758 |  |  |
Liabilities |  |  |  |  |  |  |  |
Time deposits |  | 0 |  |  |  |  |  |
Debt |  | 783,600 |  |  | 1,240,560 |  |  |
Total liabilities |  | 783,859 |  |  | 1,240,756 |  |  |
Level 1 | Fair Value, Recurring |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Investments in AFS debt securities |  | 137,388 |  |  | 129,835 |  |  |
Loans at fair value |  | 0 |  |  | 0 |  |  |
Servicing rights |  | 0 |  |  | 0 |  |  |
Derivative assets |  | 2,243 |  |  | 0 |  |  |
Digital assets safeguarding asset |  | 0 |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Derivative liabilities |  | 259 |  |  | 196 |  |  |
Digital assets safeguarding liability |  | 0 |  |  |  |  |  |
Level 1 | Fair Value, Recurring | Asset-backed bonds |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Asset-backed bonds and residual investments |  | 0 |  |  | 0 |  |  |
Level 1 | Fair Value, Recurring | Residual Investments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Asset-backed bonds and residual investments |  | 0 |  |  | 0 |  |  |
Level 1 | Fair Value, Recurring | Non-securitization investments – ETFs |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Non-securitization investments |  |  |  |  | 1,486 |  |  |
Level 1 | Fair Value, Recurring | Third-party warrants |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 0 |  |  | 0 |  |  |
Level 1 | Fair Value, Recurring | Purchase price earn-out |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 0 |  |  | 0 |  |  |
Level 1 | Fair Value, Recurring | Interest rate lock commitments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 0 |  |  | 0 |  |  |
Level 1 | Fair Value, Recurring | Student loan commitments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Student loan commitments |  | 0 |  |  | 0 |  |  |
Level 1 | Fair Value, Recurring | Interest rate caps |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 0 |  |  | 0 |  |  |
Level 1 | Fair Value, Recurring | Residual interests classified as debt |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Residual interests classified as debt |  | 0 |  |  | 0 |  |  |
Level 1 | Fair Value, Nonrecurring | Non-securitization investments - other |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Non-securitization investments |  | 0 |  |  | 0 |  |  |
Level 2 |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 0 |  |  | 0 |  |  |
Restricted cash and restricted cash equivalents |  | 0 |  |  | 0 |  |  |
Loans at amortized cost |  | 0 |  |  | 0 |  |  |
Total assets |  | 370,281 |  |  | 324,678 |  |  |
Liabilities |  |  |  |  |  |  |  |
Time deposits |  | 18,455 |  |  |  |  |  |
Debt |  | 2,556,006 |  |  | 2,807,253 |  |  |
Total liabilities |  | 2,711,928 |  |  | 2,807,921 |  |  |
Level 2 | Fair Value, Recurring |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Investments in AFS debt securities |  | 60,545 |  |  | 65,072 |  |  |
Loans at fair value |  | 0 |  |  | 0 |  |  |
Servicing rights |  | 0 |  |  | 0 |  |  |
Derivative assets |  | 0 |  |  | 5,444 |  |  |
Digital assets safeguarding asset |  | 112,010 |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Derivative liabilities |  | 25,457 |  |  | 668 |  |  |
Digital assets safeguarding liability |  | 112,010 |  |  |  |  |  |
Level 2 | Fair Value, Recurring | Asset-backed bonds |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Asset-backed bonds and residual investments |  | 193,739 |  |  | 253,669 |  |  |
Level 2 | Fair Value, Recurring | Residual Investments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Asset-backed bonds and residual investments |  | 0 |  |  | 0 |  |  |
Level 2 | Fair Value, Recurring | Non-securitization investments – ETFs |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Non-securitization investments |  |  |  |  | 0 |  |  |
Level 2 | Fair Value, Recurring | Third-party warrants |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 0 |  |  | 0 |  |  |
Level 2 | Fair Value, Recurring | Purchase price earn-out |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 0 |  |  | 0 |  |  |
Level 2 | Fair Value, Recurring | Interest rate lock commitments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 0 |  |  | 0 |  |  |
Level 2 | Fair Value, Recurring | Student loan commitments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Student loan commitments |  | 0 |  |  | 0 |  |  |
Level 2 | Fair Value, Recurring | Interest rate caps |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 3,987 |  |  | 493 |  |  |
Level 2 | Fair Value, Recurring | Residual interests classified as debt |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Residual interests classified as debt |  | 0 |  |  | 0 |  |  |
Level 2 | Fair Value, Nonrecurring | Non-securitization investments - other |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Non-securitization investments |  | 0 |  |  | 0 |  |  |
Level 3 |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 0 |  |  | 0 |  |  |
Restricted cash and restricted cash equivalents |  | 0 |  |  | 0 |  |  |
Loans at amortized cost |  | 264,348 |  |  | 118,412 |  |  |
Total assets |  | 8,520,963 |  |  | 6,378,336 |  |  |
Liabilities |  |  |  |  |  |  |  |
Time deposits |  | 0 |  |  |  |  |  |
Debt |  | 0 |  |  | 0 |  |  |
Total liabilities |  | 54,690 |  |  | 93,682 |  |  |
Level 3 | Fair Value, Recurring |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Investments in AFS debt securities |  | 0 |  |  | 0 |  |  |
Loans at fair value |  | 7,959,382 |  |  | 5,952,972 |  |  |
Servicing rights |  | 176,964 |  |  | 168,259 |  |  |
Derivative assets |  | 0 |  |  | 0 |  |  |
Digital assets safeguarding asset |  | 0 |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Derivative liabilities |  | 0 |  |  | 0 |  |  |
Digital assets safeguarding liability |  | 0 |  |  |  |  |  |
Level 3 | Fair Value, Recurring | Asset-backed bonds |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Asset-backed bonds and residual investments |  | 0 |  |  | 0 |  |  |
Level 3 | Fair Value, Recurring | Residual Investments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Asset-backed bonds and residual investments |  | 94,978 |  |  | 121,019 |  |  |
Level 3 | Fair Value, Recurring | Non-securitization investments – ETFs |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Non-securitization investments |  |  |  |  | 0 |  |  |
Level 3 | Fair Value, Recurring | Third-party warrants |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 766 |  |  | 1,369 |  |  |
Level 3 | Fair Value, Recurring | Purchase price earn-out |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 625 |  |  | 4,272 |  |  |
Level 3 | Fair Value, Recurring | Interest rate lock commitments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 1,120 |  |  | 3,759 |  |  |
Level 3 | Fair Value, Recurring | Student loan commitments |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Student loan commitments |  | 254 |  |  | 2,220 |  |  |
Level 3 | Fair Value, Recurring | Interest rate caps |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Derivative assets |  | 0 |  |  | 0 |  |  |
Level 3 | Fair Value, Recurring | Residual interests classified as debt |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Residual interests classified as debt |  | 54,436 |  |  | 93,682 |  |  |
Level 3 | Fair Value, Nonrecurring | Non-securitization investments - other |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Non-securitization investments |  | $ 22,780 |  |  | $ 6,054 |  |  |
[1] | Financial statement line items include amounts in consolidated variable interest entities (“VIEs”). See Note 5.(2)As of June 30, 2022 and December 31, 2021, includes loans held for sale measured at fair value of $7,959,382 and $5,952,972, respectively.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Obligation reflecting another party's right to economic interests in another entity or trust under a contractual right. For example, an investor may purchase a beneficial interest in a securitization transaction. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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