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Loans and the Allowance for Loan Losses, Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 21,222 $ 20,830
Recorded Investment, Without Valuation Allowance 18,109 16,049
Recorded Investment, With Valuation Allowance 1,181 2,426
Associated Allowance 341 95
Average Recorded Investment 20,240 18,626
Interest Income Recognized 118 742
Mortgage Loans on Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 19,943 19,715
Recorded Investment, Without Valuation Allowance 17,279 15,213
Recorded Investment, With Valuation Allowance 1,013 2,426
Associated Allowance 273 95
Average Recorded Investment 19,235 17,197
Interest Income Recognized 114 712
Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,059 2,873
Recorded Investment, Without Valuation Allowance 1,944 2,499
Recorded Investment, With Valuation Allowance 94 316
Associated Allowance 49 52
Average Recorded Investment 2,042 2,525
Interest Income Recognized 16 90
Mortgage Loans on Real Estate [Member] | Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 16,290 15,262
Recorded Investment, Without Valuation Allowance 14,245 11,622
Recorded Investment, With Valuation Allowance 436 1,644
Associated Allowance 164 1
Average Recorded Investment 15,596 13,541
Interest Income Recognized 93 579
Mortgage Loans on Real Estate [Member] | Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 813 814
Recorded Investment, Without Valuation Allowance 722 721
Recorded Investment, With Valuation Allowance 91 92
Associated Allowance 17 18
Average Recorded Investment 814 406
Interest Income Recognized 1 23
Mortgage Loans on Real Estate [Member] | Second Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 469 473
Recorded Investment, Without Valuation Allowance 315 318
Recorded Investment, With Valuation Allowance 134 135
Associated Allowance 14 14
Average Recorded Investment 471 464
Interest Income Recognized 4 20
Mortgage Loans on Real Estate [Member] | Equity Line of Credit [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 312 293
Recorded Investment, Without Valuation Allowance 53 53
Recorded Investment, With Valuation Allowance 258 239
Associated Allowance 29 10
Average Recorded Investment 312 261
Interest Income Recognized 0 0
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,109 1,115
Recorded Investment, Without Valuation Allowance 830 836
Recorded Investment, With Valuation Allowance 0 0
Associated Allowance 0 0
Average Recorded Investment 836 1,388
Interest Income Recognized 0 30
Consumer [Member] | Other Consumer Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 170 0
Recorded Investment, Without Valuation Allowance 0 0
Recorded Investment, With Valuation Allowance 168 0
Associated Allowance 68 0
Average Recorded Investment 169 41
Interest Income Recognized $ 4 $ 0