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Loans Held for Investment and Allowance for Credit Losses - Outstanding Loan Balances Categorized by Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 337,635	$ 236,601
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		211,319
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		573
Classified/Doubtful/Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		450
SBA
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		145,172
SBA | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		144,149
SBA | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		573
SBA | Classified/Doubtful/Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		450
Commercial, non-real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		11,484
Commercial, non-real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		11,484
Commercial, non-real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Commercial, non-real estate | Classified/Doubtful/Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	49,046	37,815
Residential real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	33,183	37,815
Residential real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	655	0
Residential real estate | Classified/Doubtful/Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	183,579	12,063
Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	101,408	12,063
Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,835	0
Commercial real estate | Classified/Doubtful/Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,870	5,808
Consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,858	5,808
Consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Consumer | Classified/Doubtful/Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Retained Strategic Program loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	20,040	$ 24,259
Retained Strategic Program loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0
Retained Strategic Program loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 0

X

- 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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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
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