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Loans Held-for-Sale, Net - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Sale of loans held-for-sale excluding acquired loans |  | $ 4,890,000,000 | $ 5,440,000,000 | $ 6,420,000,000
Amount of securitizations |  |  | 43,400,000 | 85,700,000
Unrealized impairment loss |  | (1,989,000) | (15,703,000) |
Loans held-for-sale, nonaccrual |  | 0 | 0 |
Greater Than 90 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held-for-sale 90 or more days past due |  | $ 0 | 0 |
US Government Sponsored-Enterprise Insured Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Period of loans held for sale sold |  | 60 days |  |
Private Label |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Period of loans held for sale sold |  | 180 days |  |
Sale of loans held-for-sale excluding acquired loans |  |  | $ 489,300,000 | $ 985,100,000
Gain on sale of financing receivable | $ 900,000 |  |  |

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- Definition Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) -Publisher SEC Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-7 + Details
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