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Significant Accounting Policies - Gain on Sale of Loans, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gains on sales of loans, net | $ 145,535 | $ (10) | $ 3,679 | $ 399,111 | $ (247) | $ (4) | $ (369) | $ 238,935 | $ 548,315 | $ 238,315 | $ 0
Proceeds from sale of loans receivable |  |  |  |  |  |  |  |  | 4,240,000 | 3,100,000 |
Net proceeds from sales of loans held for investment, principal |  |  |  |  |  |  |  |  | 3,980,000 | 2,900,000 |
Net proceeds from sales of loans held for investment, capitalized interest |  |  |  |  |  |  |  |  | $ 264,000 | $ 199,000 |

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- Definition Net Proceeds From Sales Of Student Loans Held For Sale, Principal + References No definition available. + Details
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- Definition Amount of gain (loss) on sale of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107425-111719 + Details
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- Definition The cash inflow associated with the sale of loans receivables arising from the financing of goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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