Derivatives - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2016 USD ($) Derivative
Derivative [Line Items]
Interest expense	$ 60,453,000	$ 39,562,000	$ 24,966,000
Reclassification Out of Accumulated Other Comprehensive Income
Derivative [Line Items]
Interest expense	243,000
Interest Rate Swaps
Derivative [Line Items]
Debt securities, available-for-sale, restricted	30,000,000.0	$ 498,000
Cash Flow Hedging | Interest Rate Swaps
Derivative [Line Items]
Number of derivatives | Derivative				2
Notional amount				$ 30,000,000.0
Average interest rate				1.10%
Interest expense	$ 409,000