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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2023 USD ($) trust office county segment
Significant Accounting Policies [Line Items] |
Number of subsidiary business trusts (in trusts) | 5
Number of subsidiary business trusts organized by the company (in trusts) | 2
Company's investments in the trusts | $ | $ 1.8
Number of business segment (in segments) | segment | 1
Loans contractual past due | 90 days
North Valley Bancorp |
Significant Accounting Policies [Line Items] |
Number of loan production offices (in offices) | office | 3
Minimum |
Significant Accounting Policies [Line Items] |
Loan term | 5 years
Amortization period | 15 years
Maximum |
Significant Accounting Policies [Line Items] |
Loan term | 10 years
Amortization period | 30 years
California |
Significant Accounting Policies [Line Items] |
Number of counties (in counties) | county | 31

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- Definition Number Of Counties Bank Operates + References No definition available. + Details
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- Definition This element represents the aggregate cost of investments accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Period between issuance and maturity of loan held for sale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + Details
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