Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 156,277	$ 156,277
Amortization of intangible assets	868	1,025	$ 1,182
Core Deposits
Goodwill And Intangible Assets [Line Items]
Core deposit intangible	$ 2,400	$ 3,300