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Loans (Impaired Loans by Loan Classification) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Recorded Investment, without a valuation allowance $ 1,053 $ 1,164
Unpaid Principal Balance, without a valuation allowance 1,113 1,267
Associated Allowance, without a valuation allowance
Average Recorded Investment, without a valuation allowance 1,106 1,322
Interest Income Recognized, without a valuation allowance 27 66
Recorded Investment, total 2,644 2,766
Unpaid Principal Balance, total 2,704 2,869
Associated Allowance, total 51 90
Average Recorded Investment, total 2,703 2,709
Interest Income Recognized, total 64 152
Land and land development [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, without a valuation allowance 28 32
Unpaid Principal Balance, without a valuation allowance 88 90
Associated Allowance, without a valuation allowance
Average Recorded Investment, without a valuation allowance 29 37
Interest Income Recognized, without a valuation allowance
1-4 family residential, first lien, owner occupied [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, without a valuation allowance 82
Unpaid Principal Balance, without a valuation allowance 127
Associated Allowance, without a valuation allowance
Average Recorded Investment, without a valuation allowance 40 90
Interest Income Recognized, without a valuation allowance
1-4 family residential, junior lien [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, without a valuation allowance 122 127
Unpaid Principal Balance, without a valuation allowance 122 127
Associated Allowance, without a valuation allowance
Average Recorded Investment, without a valuation allowance 124 248
Interest Income Recognized, without a valuation allowance 3 15
Commercial non-owner occupied [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, without a valuation allowance 903 923
Unpaid Principal Balance, without a valuation allowance 903 923
Associated Allowance, without a valuation allowance
Average Recorded Investment, without a valuation allowance 913 947
Interest Income Recognized, without a valuation allowance 24 51
Student Loans Purchased [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, with a valuation allowance 1,591 1,602
Unpaid Principal Balance, with a valuation allowance 1,591 1,602
Associated Allowance, with a valuation allowance 51 90
Average Recorded Investment, with a valuation allowance 1,597 1,387
Interest Income Recognized, with a valuation allowance 37 86
Impaired loans with a valuation allowance [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, with a valuation allowance 1,591 1,602
Unpaid Principal Balance, with a valuation allowance 1,591 1,602
Associated Allowance, with a valuation allowance 51 90
Average Recorded Investment, with a valuation allowance 1,597 1,387
Interest Income Recognized, with a valuation allowance $ 37 $ 86