Derivatives - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Aug. 01, 2021 USD ($)	Jun. 30, 2021 USD ($) derivative	Dec. 31, 2020 USD ($)
Derivative [Line Items]
Interest expense	$ 5,600	$ 9,299	$ 17,781	$ 33,431
Interest rate swap (cash flow hedge)
Derivative [Line Items]
Debt securities, pledged as collateral, available-for-sale, restricted	60,500		60,500				$ 83,200
Notional amount							$ 30,000
Interest rate swap (cash flow hedge) | Cash Flow Hedging
Derivative [Line Items]
Number of derivatives | derivative						2
Notional amount						$ 30,000
Average interest rate						1.10%
Derivative liability, amount matured					$ 10,000	$ 20,000
Interest rate swap (cash flow hedge) | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income
Derivative [Line Items]
Interest expense	$ 8	$ 58	$ 142	$ 17