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Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] - USD ($) $ / shares in Units, $ in Millions	Dec. 15, 2019	Nov. 20, 2019
Dividend per common stock		$ 0.1425
Virginia Community Bankshares, Inc [Member]
Cash paid per share	$ 58.00
Shares issued per share	$ 3.05
Percentage of stock issued under business combination	60.00%
Percentage of cash paid under business combination	40.00%
Number of shares expected to issue	1,312,970
Expected payments under business combination	$ 16.6

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