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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
county
segment
trust
office
Significant Accounting Policies [Line Items]  
Number of subsidiary business trusts (in trusts) 5
Number of loan production offices (in offices) 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 subsidiary business trusts (in trusts) | 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 33