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Loans Held for Sale - Narrative (Details) - USD ($)		3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Loans held-for-sale, nonperforming loans	$ 0	$ 0	$ 0
Loans held-for-sale (including nonperforming loans)					$ 6,200,000
Investment securities held to maturity	1,258,560,000	1,258,560,000	1,258,560,000		$ 840,259,000
Cash proceeds from sale of consumer installment loans			397,107,000	$ 34,719,000
Consumer Loan, Held-For-Sale | Personal And Other Installment Loans
Debt Securities, Available-for-sale [Line Items]
Carrying value of consumer loans sold	556,700,000
Consumer Loan, Held-For-Sale | Other Installment Loans
Debt Securities, Available-for-sale [Line Items]
Carrying value of consumer loans sold		154,000,000
Variable Interest Entity, Not Primary Beneficiary
Debt Securities, Available-for-sale [Line Items]
Investment securities held to maturity	436,800,000	$ 436,800,000	$ 436,800,000
Cash proceeds from sale of consumer installment loans	$ 115,100,000

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Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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