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Loans Held for Sale - Narrative (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Medical loans, held for sale |  |  |  |  | $ 200,000
Personal loans, held-for-sale |  |  |  |  | 127,900
Carrying value of consumer loans sold |  |  | $ 521,800 |  |
Investment securities held to maturity |  | $ 840,259 |  | $ 1,103,170 | 840,259
Proceeds from sale of finance receivables |  | 100,700 |  |  |
Personal and Other Installment Loans | Consumer Loan Held For Sale |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Carrying value of consumer loans sold | $ 556,700 |  |  | 556,700 |
Other Installment Loans | Consumer Loan Held For Sale |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Carrying value of consumer loans sold | $ 154,000 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Investment securities held to maturity |  | $ 400,000 |  | 436,800 | $ 400,000
Proceeds from sale of finance receivables |  |  |  | $ 115,100 |

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