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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
shares
Jun. 30, 2019
shares
Jun. 30, 2020
shares
Jun. 30, 2019
shares
Aug. 07, 2020
USD ($)
Deferral
Summary Of Significant Accounting Policies [Line Items]          
Dilutive common shares outstanding | shares 0 0 0 0  
Subsequent Event [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Number of executed deferrals on outstanding loan balances as per interagency | Deferral         545
Executed deferrals on outstanding Loan balance as per interagency | $         $ 104.8