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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2020
shares
Mar. 31, 2019
shares
May 11, 2020
USD ($)
Deferral
Summary Of Significant Accounting Policies [Line Items]      
Dilutive common shares outstanding | shares 0 0  
Subsequent Event [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Number of executed deferrals on outstanding loan balances as per interagency | Deferral     459
Executed deferrals on outstanding Loan balance as per interagency | $     $ 97.7