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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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Medical Loans, Held For Sale

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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).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The cash inflow associated with the sale of receivables arising from the financing of goods and services.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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