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Loans Held for Sale - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Loans held-for-sale (including nonperforming loans) |  |  |  | $ 200 |  | $ 6,200
Carrying value of consumer loans sold |  |  | $ 521,800 |  | $ 521,800 |
Investment securities held to maturity |  |  |  | 1,178,370 |  | $ 840,259
Cash proceeds from sale of consumer installment loans |  |  |  | 409,503 | $ 136,920 |
Consumer Loan, Held-For-Sale | Personal And Other Installment Loans |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Carrying value of consumer loans sold | $ 556,700 |  |  |  |  |
Consumer Loan, Held-For-Sale | Other Installment Loans |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Carrying value of consumer loans sold |  | $ 154,000 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Investment securities held to maturity |  |  |  | $ 436,800 |  |
Cash proceeds from sale of consumer installment loans | $ 115,100 |  |  |  |  |

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