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Related Party Transactions - Summary of Deposits and Withdrawals Made by Related Parties (Detail) - USD ($) $ / shares in Units, $ in Millions	Mar. 20, 2020	Jun. 30, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Preferred stock, par value ($ per share)		$ 0.01	$ 0.01
One-time cash payment	$ 50.2
Other Assets
Related Party Transaction [Line Items]
Equity method investment		$ 7.8
Ownership (percent)		22.00%
Common Stock \| Largest Stockholder
Related Party Transaction [Line Items]
Conversion of stock, shares of common stock converted and retired (shares)	19,562,881
Series A Preferred Stock
Related Party Transaction [Line Items]
Preferred stock, par value ($ per share)	$ 0.01
Series A Preferred Stock \| Largest Stockholder
Related Party Transaction [Line Items]
Conversion of stock, shares issued (shares)	195,628