Segment Information - Summary of Segment Information (Parenthetical) (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting [Abstract]
Taxable-equivalent adjustment	$ 3,732,000	$ 4,234,000	$ 7,465,000	$ 9,297,000