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Investment Securities - Narrative (Details) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2023 USD ($) security corporateNote | Dec. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Proceeds from sales of foreign subsidiaries |  |  |  | $ 0 | $ 0 | $ 3,765
Loss on sale of foreign subsidiaries |  |  |  | 0 | 0 | 2,840
Unrealized gain (loss) on investment securities |  |  |  |  |  | 2,700
Proceeds from sales of investment securities available for sale |  |  |  | $ 297,417 | $ 983,575 | 689,856
Number of available-for-sale investment securities in the less than twelve month category (security) | security |  |  |  | 17 |  |
Number of available-for-sale investment securities in the twelve month or more category (security) | security |  |  |  | 102 |  |
Number of asset-backed securities with deterioration in future estimated cash flows | security |  |  |  | 1 | 4 |
Number of corporate notes with deterioration in future estimated cash flows | corporateNote |  |  |  | 17 |  |
Number of available-for-sale investment securities, unrealized loss position | security |  |  |  | 119 | 156 |
Debt securities, available for sale |  |  |  | $ 2,376,860 | $ 2,961,015 |
Accrued interest on held-to-maturity debt securities |  |  |  | $ 2,700 | $ 1,000 |
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] |  |  |  | Accrued interest receivable | Accrued interest receivable |
Transfer of investment securities available for sale to held to maturity |  |  | $ 500,200 | $ 0 | $ 500,174 | 0
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity |  |  | $ 50,000 | 4,986 | 0 | 0
Carrying value of consumer loans sold |  | $ 521,800 |  |  |  |
Loss on sale of loans |  | $ 23,500 |  | (200) | (3,200) | $ (11,300)
Gain on sale of SBA and other loans |  |  |  | 1,200 |  |
Investment securities held to maturity |  |  |  | 1,103,170 | 840,259 |
Servicing asset |  |  |  | 3,800 |  |
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest |  |  |  | 0 | 0 |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Investment securities held to maturity |  |  |  | 436,800 | 400,000 |
Asset Pledged as Collateral |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt securities, available for sale |  |  |  | 1,200,000 |  |
Pledged investment securities transferred from available for sale to held to maturity |  |  |  | 398,400 | 16,700 |
Asset-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt securities, available for sale |  |  |  | 92,629 | 160,542 |
Investment securities held to maturity |  |  |  | 575,990 | 361,107 |
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest |  |  |  | 0 | $ 0 |
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 |  |  | $ 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 |  |  |  |  |

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