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Subsequent Events - Additional Information (Detail) - Subsequent Event - USD ($)
$ in Thousands
3 Months Ended
Oct. 29, 2020
Oct. 16, 2020
Dec. 31, 2020
Commercial Loans      
Subsequent Event [Line Items]      
Sale of loans held-for-sale   $ 25,400  
Gain (loss) on sale of loans     $ (92)
PPP Loans      
Subsequent Event [Line Items]      
Sale of loans held-for-sale $ 298,100    
Gain (loss) on sale of loans     $ 5,100