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Loans and Allowance for Loan Losses - Summary of Loans by Credit Quality Risk Rating (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross $ 941,058 $ 768,723 $ 768,723
Less net deferred origination fees and premiums (1,955) (824)  
Loans receivable 939,103 767,899  
Commercial and Industrial Loans      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 111,401 90,390 90,390
Construction, Land and Land Development      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 97,034 64,045 64,045
Residential Real Estate      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 115,011 94,745 94,745
Commercial Real Estate      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 613,398 515,959 515,959
Consumer and Other Loans      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 4,214 3,584 $ 3,584
Pass      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 929,753 750,808  
Pass | Commercial and Industrial Loans      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 104,911 84,859  
Pass | Construction, Land and Land Development      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 97,034 55,666  
Pass | Residential Real Estate      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 114,823 94,548  
Pass | Commercial Real Estate      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 608,773 512,151  
Pass | Consumer and Other Loans      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 4,212 3,584  
Other Loans Especially Mentioned      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 9,488 14,959  
Other Loans Especially Mentioned | Commercial and Industrial Loans      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 4,740 3,908  
Other Loans Especially Mentioned | Construction, Land and Land Development      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross   8,379  
Other Loans Especially Mentioned | Residential Real Estate      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 123 125  
Other Loans Especially Mentioned | Commercial Real Estate      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 4,625 2,547  
Sub-Standard      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 1,817 2,956  
Sub-Standard | Commercial and Industrial Loans      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 1,750 1,623  
Sub-Standard | Residential Real Estate      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross 65 72  
Sub-Standard | Commercial Real Estate      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross   $ 1,261  
Sub-Standard | Consumer and Other Loans      
Loans And Leases Receivable Disclosure [Line Items]      
Loans, gross $ 2