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Other Borrowed Funds - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal home loan bank stock $ 6,012  
Unsecured Lines of Credit [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Maximum overnight line of credit facilities available 24,000 $ 19,000
Overnight line of credit facilities outstanding $ 0 0
FHLB [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal home loan bank advances, maximum borrowing capacity percentage on assets 30.00%  
Federal home loan bank advance $ 124,800 $ 73,100
FHLB [Member] | Line of Credit [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Assets pledged with federal home loan bank against credit facilities 220,600  
FHLB [Member] | 1-4 Family Residential Loans [Member] | Line of Credit [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Assets pledged with federal home loan bank against credit facilities 44,900  
FHLB [Member] | Multi-Family Residential Loans [Member] | Line of Credit [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Assets pledged with federal home loan bank against credit facilities 9,600  
FHLB [Member] | Commercial Real Estate Loans [Member] | Line of Credit [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Assets pledged with federal home loan bank against credit facilities 49,200  
FHLB [Member] | Securities [Member] | Line of Credit [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Assets pledged with federal home loan bank against credit facilities 58,200  
FHLB [Member] | Virginia Public Deposits [Member] | Letter of Credit [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Assets pledged with federal home loan bank against credit facilities $ 10,000  
FHLB [Member] | Minimum [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal home loan bank, advances, interest Rate 1.69%  
FHLB [Member] | Maximum [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal home loan bank, advances, interest Rate 2.49%  
FHLB [Member] | Restricted Investments [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal home loan bank stock $ 6,000