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Loans Held for Investment and Allowance for Credit Losses - Strategic Program Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Retained Strategic Program loans	$ 337,635	$ 236,601
Retained Strategic Program loans
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Retained Strategic Program loans	20,040	24,259
Strategic Program loans held-for-sale	45,710	23,589
Total Strategic Program loans	$ 65,750	$ 47,848

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- Definition

Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Including Held For Sale

+ References

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481598/310-20-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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-Publisher FASB
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- Definition

Amount, before valuation allowance, of financing receivable classified as held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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