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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2022 USD ($) trust office segment county
Significant Accounting Policies [Line Items] |
Number of subsidiary business trusts (in trusts) | trust | 5
Company's investments in the trusts | $ | $ 1,754
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 Number Of Loan Production Offices + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599 + Details
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- Definition Amortization period for the recovery of regulatory liability, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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