Goodwill - Additional Information (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	[1]	Apr. 01, 2017 USD ($)	Dec. 31, 2000 USD ($) Branch
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill			$ 10,374		$ 7,600	$ 2,800
Number of branches acquired | Branch						5
Goodwill impairment charge	$ 10,400	$ 10,374

[1] Derived from audited December 31, 2019 Consolidated Financial Statements.