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Loans Held for Investment and Allowance for Credit Losses - Nonaccrual and Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	$ 337,635	$ 236,601
Non- Accrual	10,406
Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	337,635	236,601
Non- Accrual		0
Current
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	321,255
Current | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		232,523
Total Past Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	5,974
Total Past Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		4,078
30-59 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	4,829
30-59 Days Due Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		3,083
60-89 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	777
60-89 Days Due Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		802
90+ Days Past Due & Still Accruing
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	368
90+ Days Past Due & Still Accruing | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		193
Construction and land development
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	26,668
Non- Accrual	0
Construction and land development | Current
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	26,371
Construction and land development | Total Past Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	297
Construction and land development | 30-59 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Construction and land development | 60-89 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Construction and land development | 90+ Days Past Due & Still Accruing
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	297
Residential real estate
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	49,046	37,815
Non- Accrual	118
Residential real estate | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		37,815
Non- Accrual		0
Residential real estate | Current
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	48,928
Residential real estate | Current | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		37,387
Residential real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Residential real estate | Total Past Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		428
Residential real estate | 30-59 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Residential real estate | 30-59 Days Due Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		428
Residential real estate | 60-89 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Residential real estate | 60-89 Days Due Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		0
Residential real estate | 90+ Days Past Due & Still Accruing
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Residential real estate | 90+ Days Past Due & Still Accruing | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		0
Residential real estate multifamily
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	602
Non- Accrual	0
Residential real estate multifamily | Current
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	602
Residential real estate multifamily | Total Past Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Residential real estate multifamily | 30-59 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Residential real estate multifamily | 60-89 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Residential real estate multifamily | 90+ Days Past Due & Still Accruing
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Commercial real estate
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	183,579	12,063
Non- Accrual	10,267
Commercial real estate | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		12,063
Non- Accrual		0
Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	169,497
Commercial real estate | Current | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		12,063
Commercial real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	3,815
Commercial real estate | Total Past Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		0
Commercial real estate | 30-59 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	3,815
Commercial real estate | 30-59 Days Due Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		0
Commercial real estate | 60-89 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Commercial real estate | 60-89 Days Due Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		0
Commercial real estate | 90+ Days Past Due & Still Accruing
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Commercial real estate | 90+ Days Past Due & Still Accruing | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		0
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	19,364
Non- Accrual	21
Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	19,323
Commercial and industrial | Total Past Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	20
Commercial and industrial | 30-59 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	20
Commercial and industrial | 60-89 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Commercial and industrial | 90+ Days Past Due & Still Accruing
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Consumer
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	6,870	5,808
Non- Accrual	0
Consumer | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		5,808
Non- Accrual		0
Consumer | Current
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	6,806
Consumer | Current | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		5,776
Consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	64
Consumer | Total Past Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		32
Consumer | 30-59 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	44
Consumer | 30-59 Days Due Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		32
Consumer | 60-89 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	7
Consumer | 60-89 Days Due Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		0
Consumer | 90+ Days Past Due & Still Accruing
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	13
Consumer | 90+ Days Past Due & Still Accruing | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		0
Lease financing receivables
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	31,466
Non- Accrual	0
Lease financing receivables | Current
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	31,466
Lease financing receivables | Total Past Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Lease financing receivables | 30-59 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Lease financing receivables | 60-89 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Lease financing receivables | 90+ Days Past Due & Still Accruing
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	0
Retained Strategic Program loans
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	20,040	24,259
Non- Accrual	0
Retained Strategic Program loans | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		24,259
Non- Accrual		0
Retained Strategic Program loans | Current
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	18,262
Retained Strategic Program loans | Current | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		22,080
Retained Strategic Program loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	1,778
Retained Strategic Program loans | Total Past Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		2,179
Retained Strategic Program loans | 30-59 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	950
Retained Strategic Program loans | 30-59 Days Due Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		1,184
Retained Strategic Program loans | 60-89 Days Due Due
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	770
Retained Strategic Program loans | 60-89 Days Due Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		802
Retained Strategic Program loans | 90+ Days Past Due & Still Accruing
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans	$ 58
Retained Strategic Program loans | 90+ Days Past Due & Still Accruing | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		193
SBA
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		145,172
SBA | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		145,172
Non- Accrual		0
SBA | Current | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		143,733
SBA | Total Past Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		1,439
SBA | 30-59 Days Due Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		1,439
SBA | 60-89 Days Due Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		0
SBA | 90+ Days Past Due & Still Accruing | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		0
Commercial, non-real estate
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		11,484
Commercial, non-real estate | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		11,484
Non- Accrual		0
Commercial, non-real estate | Current | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		11,484
Commercial, non-real estate | Total Past Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		0
Commercial, non-real estate | 30-59 Days Due Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		0
Commercial, non-real estate | 60-89 Days Due Due | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program loans		0
Commercial, non-real estate | 90+ Days Past Due & Still Accruing | Financing Receivable, Incurred Loss Methodology
Financing Receivable, Past Due [Line Items]
Retained Strategic Program 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
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-Section 45
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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