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Loans - Acquired Loans Included in Consolidated Statement of Condition (Detail) - Virginia Community Bankshares, Inc [Member] - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable Impaired [Line Items]    
Outstanding principal balance $ 148,006 $ 173,783
Carrying amount 142,533 171,466
Purchased Credit Impaired Acquired Loans Evaluated Individually for Future Credit Losses [Member]    
Financing Receivable Impaired [Line Items]    
Outstanding principal balance 1,367 1,504
Carrying amount 1,196 1,315
Other Acquired Loans [Member]    
Financing Receivable Impaired [Line Items]    
Outstanding principal balance 146,639 172,279
Carrying amount $ 141,337 $ 170,151