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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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