Intangible Assets and Goodwill - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Mar. 05, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Weighted-average life		6 years 7 months 6 days
Goodwill		$ 149,922	$ 149,922	$ 148,604
Citizens Bankshares, Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Date of acquisition	Mar. 05, 2020
Goodwill	$ 1,300
Customer Related Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-average life		3 years 6 months
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-average life		6 years 8 months 12 days