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Summary of Significant Accounting Policies (Detail) | 12 Months Ended
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Dec. 31, 2024 USD ($) segment trust office county | Dec. 31, 2023 USD ($) | Dec. 31, 2022 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 | $ 1,800,000 |  |
Number of business segments (in segments) | segment | 1 |  |
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 | 31 |  |

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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 -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3D -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-3D + Details
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