Junior Subordinated Debt - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) location trust	Dec. 31, 2020 USD ($)
Class of Stock [Line Items]
Number of subsidiary business trusts (in trusts) | trust	5
Preferred stock, value issued | $	$ 0	$ 0
Interest deferral period	5 years
Number of locations organized (in locations) | location	2
Wholly owned subsidiaries
Class of Stock [Line Items]
Preferred stock, value issued | $	$ 63,000
North Valley Bancorp
Class of Stock [Line Items]
Number of subsidiary business trusts (in trusts) | trust	3
Number of locations acquired (in locations) | location	3