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Loans - Summary of Balances of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Summary of balances of loans    
Total loans $ 854,359 $ 766,296
Net unamortized deferred loan (fees) costs (79) 200
Allowance for loan losses (7,287) (7,770) [1]
Loans receivable, net 846,993 758,726 [1]
Construction, land and land development    
Summary of balances of loans    
Total loans 94,750 66,042
Farmland    
Summary of balances of loans    
Total loans 748 923
Commercial mortgages (non-owner occupied)    
Summary of balances of loans    
Total loans 171,996 146,757
Commercial mortgages (owner occupied)    
Summary of balances of loans    
Total loans 82,391 80,052
Residential first mortgages    
Summary of balances of loans    
Total loans 293,266 269,365
Residential revolving and junior mortgages    
Summary of balances of loans    
Total loans 39,170 46,498
Commercial and industrial    
Summary of balances of loans    
Total loans 144,118 114,093
Consumer    
Summary of balances of loans    
Total loans $ 27,920 $ 42,566
[1] Derived from audited December 31, 2017 Consolidated Financial Statements.