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Loans - Summary of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans before deferred costs $ 565,692 $ 548,405
Deferred loan costs 521 569
Total Loans 566,213 548,974
Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans before deferred costs 140,835 146,875
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans before deferred costs 212,677 183,605
Residential Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans before deferred costs 176,984 167,296
Construction & Land Development [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans before deferred costs 14,946 31,227
Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans before deferred costs $ 20,250 $ 19,402