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Earnings Per Common Share - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 09, 2016
Sep. 30, 2016
Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Shares contingently issuable under shareholder return plan   0 0
Your Community Bankshares, Inc [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Shares issued for acquisition, shares 5,423,348    
Your Community Bankshares, Inc [Member] | Treasury Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Number of treasury shares sold 109,257    
Stock Option [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Stock options excluded from computation of diluted earnings per share   96,600 185,250