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Borrowings - Additional Information (Detail)
12 Months Ended
May 28, 2015
USD ($)
Dec. 31, 2018
USD ($)
Loan
Dec. 31, 2017
USD ($)
Loan
Debt Instrument [Line Items]      
Federal Home Loan Bank advances   $ 100,000,000 $ 70,000,000
Number of FHLB debt advances | Loan   4 2
Federal home loan bank advances secured   $ 299,100,000  
Immediate available credit   138,100,000  
Total line of credit   256,100,000  
Letters of credit issued   18,000,000  
Remaining available borrowings under FHLB credit line   18,000,000  
Securities sold under repurchase agreements   $ 6,089,000 $ 9,498,000
Securities sold under agreements to repurchase, average rates   0.22% 0.17%
Interest Rate   2.67%  
Unused lines of Credit      
Debt Instrument [Line Items]      
Unused lines of credit   $ 21,000,000 $ 24,500,000
Virginia BanCorp      
Debt Instrument [Line Items]      
Debt instrument, maturity date   Jun. 14, 2024  
Debt acquired in merger   $ 1,700,000 1,100,000
Debt instrument, maturity date range, start   Mar. 01, 2019  
Debt instrument, maturity date range, end   Dec. 31, 2027  
Virginia BanCorp | Four ESOP Notes      
Debt Instrument [Line Items]      
Interest Rate   3.25%  
Virginia BanCorp | One ESOP Notes      
Debt Instrument [Line Items]      
Interest Rate   4.50%  
Subordinated Debt Due May 2025      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 7,000,000    
Interest Rate 6.50%    
Debt instrument, maturity date May 28, 2025    
Debt instrument, frequency of payment   First of March and September of each year  
Debt instrument integral multiple principal amount $ 1,000    
Debt instrument redemption period start date May 28, 2020    
Aggregate carrying value of notes, including capitalized debt issuance cost   $ 6,900,000 $ 6,900,000
Effective interest rate   6.85% 6.86%