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Loans Held for Investment and Allowance for Credit Losses - Portfolio Classes by Incurred Loss Methodology (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Strategic Program loans	$ 337,635	$ 236,601
Financing Receivable, Incurred Loss Methodology
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Strategic Program loans	337,635	236,601
SBA
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Strategic Program loans		145,172
SBA | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Strategic Program loans		145,172
Commercial, non-real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Strategic Program loans		11,484
Commercial, non-real estate | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Strategic Program loans		11,484
Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Strategic Program loans	49,046	37,815
Residential real estate | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Strategic Program loans		37,815
Retained Strategic Program loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Strategic Program loans	20,040	24,259
Retained Strategic Program loans | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Strategic Program loans		24,259
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Strategic Program loans	183,579	12,063
Commercial real estate | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Strategic Program loans		12,063
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Strategic Program loans	$ 6,870	5,808
Consumer | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Strategic Program loans		$ 5,808

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

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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
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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