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Borrowings - Additional Information (Detail)
3 Months Ended 6 Months Ended
May 28, 2015
USD ($)
Jun. 30, 2018
USD ($)
Loan
Jun. 30, 2017
Jun. 30, 2018
USD ($)
Loan
Jun. 30, 2017
Dec. 31, 2017
USD ($)
Loan
Debt Instrument [Line Items]            
Federal Home Loan Bank advances   $ 70,000,000   $ 70,000,000   $ 70,000,000 [1]
Number of FHLB debt advances | Loan   2   2   2
Immediate available credit   $ 172,200,000   $ 172,200,000    
Total line of credit   $ 248,200,000   $ 248,200,000    
Interest Rate   3.35%   3.35%    
Virginia BanCorp            
Debt Instrument [Line Items]            
Debt acquired in merger   $ 1,000,000   $ 1,000,000   $ 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%   3.25%    
Virginia BanCorp | One ESOP Notes            
Debt Instrument [Line Items]            
Interest Rate   4.50%   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   $ 6,900,000
Effective interest rate   6.85% 6.93% 6.85% 6.87%  
[1] Derived from audited December 31, 2017 Consolidated Financial Statements.