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Loans - Interest Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest Income That Would Have Been Recorded Based on Original Term and Rate $ 177 $ 137 $ 341 $ 341
Interest Income Recorded on a Cash Basis 47 29 77 108
Commercial, financial, and agricultural        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest Income That Would Have Been Recorded Based on Original Term and Rate 11 1 13 4
Interest Income Recorded on a Cash Basis 6 0 6 1
Real estate mortgage | Residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest Income That Would Have Been Recorded Based on Original Term and Rate 51 24 94 56
Interest Income Recorded on a Cash Basis 32 13 51 27
Real estate mortgage | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest Income That Would Have Been Recorded Based on Original Term and Rate 114 110 232 279
Interest Income Recorded on a Cash Basis 9 16 19 80
Real estate mortgage | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest Income That Would Have Been Recorded Based on Original Term and Rate 0 2 0 2
Interest Income Recorded on a Cash Basis 0 0 0 0
Installment loans to individuals        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest Income That Would Have Been Recorded Based on Original Term and Rate 1 0 2 0
Interest Income Recorded on a Cash Basis $ 0 $ 0 $ 1 $ 0