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Loans and Lease Finance Receivables and Allowance for Credit Losses - Schedule of Balance and Activity Related to Allowance for Loan Losses for Held-for-Investment Loans by Type (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 78,003	$ 82,786	$ 80,122	$ 86,842
Charge-offs	(67)	(26)	(536)	(4,344)
Recoveries	400	182	750	444
Provision for (Recapture of) Credit Losses	1,000	0	(1,000)	0
Ending balance	79,336	82,942	79,336	82,942
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	64,542	69,405	66,237	69,466
Charge-offs	0	0	0	(2,258)
Recoveries	0	0	0	0
Provision for (Recapture of) Credit Losses	852	336	(843)	2,533
Ending balance	65,394	69,741	65,394	69,741
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	240	788	312	1,277
Charge-offs	0	0		0
Recoveries	159	56	171	61
Provision for (Recapture of) Credit Losses	123	(391)	39	(885)
Ending balance	522	453	522	453
SBA [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,066	2,496	2,629	2,679
Charge-offs	(67)	(26)	(118)	(165)
Recoveries	6	13	47	94
Provision for (Recapture of) Credit Losses	(425)	25	22	(100)
Ending balance	2,580	2,508	2,580	2,508
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	6,357	5,103	6,093	9,116
Charge-offs	0	0	(413)	(1,917)
Recoveries	235	113	532	289
Provision for (Recapture of) Credit Losses	64	55	444	(2,217)
Ending balance	6,656	5,271	6,656	5,271
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	2,554	3,775	3,610	3,098
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for (Recapture of) Credit Losses	237	51	(819)	728
Ending balance	2,791	3,826	2,791	3,826
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	220	186	205	210
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for (Recapture of) Credit Losses	4	(0)	19	(24)
Ending balance	224	186	224	186
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	477	498	424	535
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for (Recapture of) Credit Losses	16	(59)	69	(96)
Ending balance	493	439	493	439
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	547	535	612	461
Charge-offs	0	(0)	(5)	(4)
Recoveries	0	0	0	0
Provision for (Recapture of) Credit Losses	129	(17)	69	61
Ending balance	$ 676	$ 518	$ 676	$ 518

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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/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 50
-Paragraph 13
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

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