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Significant Accounting Policies - Gain on Sale of Loans, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gains on sales of loans, net | $ (247) | $ (4) | $ (369) | $ 238,935 |  | $ 238,315 | $ 0 | $ 2,060
Proceeds from sale of loans receivable |  |  |  | 3,100,000 |  |  |  |
Net proceeds from sales of loans held for investment, principal |  |  |  | 2,900,000 |  |  |  |
Net proceeds from sales of loans held for investment, capitalized interest |  |  |  | 199,000 |  |  |  |
Net proceeds from sales of loans held for investment, accrued interest |  |  |  | 12,000 |  |  |  |
Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Split Loans portfolio sales price |  |  |  | $ 43,000 | $ 43,000 |  |  |
Gains on sales of loans, net |  |  |  |  | $ 2,000 |  |  |

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- Definition Net Proceeds From Sales Of Student Loans Held For Sale, Capitalized Interest + References No definition available. + Details
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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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 Reflects the net positive or negative amount derived from subtracting from net proceeds of sale and the carrying amounts, net of allocated reserves, of financial assets transferred to third parties in transactions that qualify for sales treatment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + 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=121586364&loc=d3e3179-108585 + Details
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