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Allowance for Credit Losses - Amortized Cost Basis of Loans Experiencing Financial difficulty and Modified (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Combination - Term Extension/Rate Change	$ 0		$ 211
Payment Delay/Term Extension	$ 326	$ 45	$ 1,344	$ 206
Total % of loans outstanding (percentage)	0.00%	0.02%	0.02%	0.02%
Payment Delay/Term Reduction		$ 1,043		$ 1,043
SFR HELOCs and junior liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Combination - Term Extension/Rate Change			$ 0
Payment Delay/Term Extension			$ 41	$ 0
Total % of loans outstanding (percentage)			0.01%	0.00%
Payment Delay/Term Reduction				$ 0
Commercial real estate | CRE non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Combination - Term Extension/Rate Change			$ 211
Payment Delay/Term Extension			$ 0	$ 0
Total % of loans outstanding (percentage)			0.01%	0.00%
Payment Delay/Term Reduction				$ 0
Commercial real estate | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Combination - Term Extension/Rate Change			$ 0
Payment Delay/Term Extension			$ 295	$ 0
Total % of loans outstanding (percentage)			0.029%	0.00%
Payment Delay/Term Reduction				$ 0
Commercial real estate | Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Combination - Term Extension/Rate Change	$ 0		$ 0
Payment Delay/Term Extension	$ 0	$ 0	$ 0	$ 0
Total % of loans outstanding (percentage)	0.00%	0.37%	0.00%	0.37%
Payment Delay/Term Reduction		$ 1,043		$ 1,043
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Combination - Term Extension/Rate Change	$ 0		$ 0
Payment Delay/Term Extension	$ 326	$ 45	$ 1,008	$ 206
Total % of loans outstanding (percentage)	0.07%	0.01%	0.21%	0.03%
Payment Delay/Term Reduction		$ 0		$ 0

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- Definition

Combination Payment Delay Or Term Reduction

+ References

No definition available.

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- Definition

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+ References

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- Definition

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+ References

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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 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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- Definition

Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

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