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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	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 86,842	$ 85,117	$ 65,019
Charge-offs	(4,408)	(405)	(197)
Recoveries	688	130	1,090
Initial ACL for PCD Loans at Acquisition			8,605
Provision Recorded at Acquisition			4,932
Provision for (Recapture of) Credit Losses	(3,000)	2,000	5,668
Ending Balance	80,122	86,842	85,117
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	69,466	64,806	50,950
Charge-offs	(2,258)	0	0
Recoveries	68	0	0
Initial ACL for PCD Loans at Acquisition			5,086
Provision Recorded at Acquisition			4,127
Provision for (Recapture of) Credit Losses	(1,039)	4,660	4,643
Ending Balance	66,237	69,466	64,806
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,277	1,702	765
Charge-offs	0	0	0
Recoveries	67	12	12
Initial ACL for PCD Loans at Acquisition			122
Provision Recorded at Acquisition			58
Provision for (Recapture of) Credit Losses	(1,032)	(437)	745
Ending Balance	312	1,277	1,702
SBA [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	2,679	2,809	2,668
Charge-offs	(165)	(288)	(127)
Recoveries	128	73	107
Initial ACL for PCD Loans at Acquisition			62
Provision Recorded at Acquisition			64
Provision for (Recapture of) Credit Losses	(13)	85	35
Ending Balance	2,629	2,679	2,809
SBA - PPP [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	0	0	0
Charge-offs		0	0
Recoveries		0	0
Initial ACL for PCD Loans at Acquisition			0
Provision Recorded at Acquisition			0
Provision for (Recapture of) Credit Losses		0	0
Ending Balance		0	0
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	9,116	10,206	6,669
Charge-offs	(1,981)	(109)	(66)
Recoveries	424	14	503
Initial ACL for PCD Loans at Acquisition			500
Provision Recorded at Acquisition			508
Provision for (Recapture of) Credit Losses	(1,466)	(995)	2,092
Ending Balance	6,093	9,116	10,206
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	3,098	4,400	3,066
Charge-offs	0	0	0
Recoveries	0	31	468
Initial ACL for PCD Loans at Acquisition			2,832
Provision Recorded at Acquisition			149
Provision for (Recapture of) Credit Losses	512	(1,333)	(2,115)
Ending Balance	3,610	3,098	4,400
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	210	296	100
Charge-offs	0	0	0
Recoveries	0	0	0
Initial ACL for PCD Loans at Acquisition			3
Provision Recorded at Acquisition			26
Provision for (Recapture of) Credit Losses	(5)	(86)	167
Ending Balance	205	210	296
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	535	366	188
Charge-offs	0	0	0
Recoveries	0	0	0
Initial ACL for PCD Loans at Acquisition			0
Provision Recorded at Acquisition			0
Provision for (Recapture of) Credit Losses	(111)	169	178
Ending Balance	424	535	366
Consumer and other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	461	532	613
Charge-offs	(4)	(8)	(4)
Recoveries	1	0	0
Initial ACL for PCD Loans at Acquisition			0
Provision Recorded at Acquisition			0
Provision for (Recapture of) Credit Losses	154	(63)	(77)
Ending Balance	$ 612	$ 461	$ 532

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-10

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
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-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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