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Loans (Details 5) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment $ 881,520 $ 844,157 $ 844,460
Financing Receivable, Nonaccrual 359 4,562  
Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 267 617  
Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 48  
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 1,260  
Financial Asset, Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 626 6,487  
Financial Asset, Not Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 880,894 837,670  
Commercial, Financial And Agricultural Loan [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 80,796 96,688 108,006
Financing Receivable, Nonaccrual 131 4,080  
Commercial, Financial And Agricultural Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 42 165  
Commercial, Financial And Agricultural Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 27  
Commercial, Financial And Agricultural Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment  
Commercial, Financial And Agricultural Loan [Member] | Financial Asset, Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 173 4,272  
Commercial, Financial And Agricultural Loan [Member] | Financial Asset, Not Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 80,623 92,416  
Construction Loans [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 100,061 95,282 89,250
Financing Receivable, Nonaccrual  
Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 424  
Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment  
Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 1,260  
Construction Loans [Member] | Financial Asset, Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 1,684  
Construction Loans [Member] | Financial Asset, Not Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 100,061 93,598  
Residential Mortgage [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 44,987 43,928 49,215
Financing Receivable, Nonaccrual 208 440  
Residential Mortgage [Member] | Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 56 7  
Residential Mortgage [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment  
Residential Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment  
Residential Mortgage [Member] | Financial Asset, Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 264 447  
Residential Mortgage [Member] | Financial Asset, Not Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 44,723 43,481  
Commercial Real Estate [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 620,130 573,258 561,932
Financing Receivable, Nonaccrual  
Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment  
Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment  
Commercial Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment  
Commercial Real Estate [Member] | Financial Asset, Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment  
Commercial Real Estate [Member] | Financial Asset, Not Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 620,130 573,258  
Home Equity Line of Credit [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 27,233 26,442 27,618
Financing Receivable, Nonaccrual 20 42  
Home Equity Line of Credit [Member] | Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 161  
Home Equity Line of Credit [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment  
Home Equity Line of Credit [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment  
Home Equity Line of Credit [Member] | Financial Asset, Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 181 42  
Home Equity Line of Credit [Member] | Financial Asset, Not Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 27,052 26,400  
Consumer Portfolio Segment [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 8,313 8,559 $ 8,439
Financing Receivable, Nonaccrual  
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 8 21  
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 21  
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment  
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment 8 42  
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Loans held-for-investment $ 8,305 $ 8,517