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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2022 USD ($) trust office segment county | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Significant Of Accounting Policies [Line Items] |  |  |
Number of subsidiary business trusts (in trusts) | trust | 5 |  |
Number of loan production offices (in offices) | office | 2 |  |
Company's investments in the trusts | $ 1,757,000 |  |
Number of business segments (in segments) | segment | 1 |  |
Net unrealized gains (losses) | $ 35,000 | $ (718,000) |
Accrued interest write off | 0 | 0 | $ 0
Credit losses recognized | 0 | 0 | 0
Credit loss | $ 0 | $ 0 | $ 0
Minimum |  |  |
Significant Of Accounting Policies [Line Items] |  |  |
Loans held-for-sale, term | 5 years |  |
Regulatory liability, amortization period | 15 years |  |
Maximum |  |  |
Significant Of Accounting Policies [Line Items] |  |  |
Loans held-for-sale, term | 10 years |  |
Regulatory liability, amortization period | 30 years |  |
Furniture and equipment | Minimum |  |  |
Significant Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of the related assets or lease terms | 3 years |  |
Furniture and equipment | Maximum |  |  |
Significant Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of the related assets or lease terms | 10 years |  |
Land improvements and buildings | Minimum |  |  |
Significant Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of the related assets or lease terms | 15 years |  |
Land improvements and buildings | Maximum |  |  |
Significant Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of the related assets or lease terms | 40 years |  |
North Valley Bancorp |  |  |
Significant Of Accounting Policies [Line Items] |  |  |
Number of subsidiary business trusts (in trusts) | trust | 3 |  |
California |  |  |
Significant Of Accounting Policies [Line Items] |  |  |
Number of counties (in counties) | county | 32 |  |

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- Definition Number of subsidiary business trust. + References No definition available. + Details
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- Definition Significant Of Accounting Policies [Line Items] + References No definition available. + Details
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- Definition Amount of writeoff of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized by reversing interest income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 3D -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL120267862-210455 + Details
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- Definition Amount of credit loss expense on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) transferred into available-for-sale out of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8B -URI https://asc.fasb.org/extlink&oid=124260329&loc=SL120268709-111562 + 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 https://asc.fasb.org/extlink&oid=126901519&loc=d3e8672-108599 + Details
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