Other Employee Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Plan Assets, Administration Expense	$ 1,200,000	$ 835,000
Supplemental Unemployment Benefits, Salary Continuation	$ 3,300,000	$ 2,100,000
Minimum [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.25%
Maximum [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		3.50%
California Bank of Commerce Profit Sharing Plan [Member]
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage	20.00%
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 745,000	$ 618,000