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Acquisition - Additional Information (Detail) - $ / shares
Aug. 12, 2020
Dec. 15, 2019
Business Acquisition [Line Items]    
Cash per share received by share holders   $ 58.00
Common stock shares received by shareholders   3.05
Bay Banks of Virginia, Inc., [Member]    
Business Acquisition [Line Items]    
Common stock conversion number of shares right to receive upon conversion of each common stock share 0.5000