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Loans - Acquired Loans Included in Consolidated Statement of Condition (Detail) - Virginia Community Bankshares, Inc [Member] - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable Impaired [Line Items]    
Outstanding principal balance $ 110,332 $ 173,783
Carrying amount 109,001 171,466
Purchased Credit Impaired Acquired Loans Evaluated Individually for Future Credit Losses [Member]    
Financing Receivable Impaired [Line Items]    
Outstanding principal balance 1,336 1,504
Carrying amount 1,148 1,315
Other Acquired Loans [Member]    
Financing Receivable Impaired [Line Items]    
Outstanding principal balance 108,996 172,279
Carrying amount $ 107,853 $ 170,151