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Loans and Asset Quality Information (Schedule of Impaired Loans) (Details) - All Total Loans [Member] - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment $ 13,509 $ 11,565
Impaired loans with no related allowance - Unpaid Principal Balance 14,850 13,802
Impaired loans with no related allowance - Average Recorded Investment 12,293 13,461
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 19,509 15,650
Impaired loans with allowance - Unpaid Principal Balance 20,511 15,893
Impaired loans with related allowance - Related Allowance 4,987 1,564
Impaired loans with related allowance - Average Recorded Investment 16,633 16,229
Commercial, financial, and agricultural [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 2,530 183
Impaired loans with no related allowance - Unpaid Principal Balance 2,580 425
Impaired loans with no related allowance - Average Recorded Investment 928 276
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 678 396
Impaired loans with allowance - Unpaid Principal Balance 708 396
Impaired loans with related allowance - Related Allowance 277 215
Impaired loans with related allowance - Average Recorded Investment 479 214
Real estate - construction, land development & other land loans [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 2,948 2,743
Impaired loans with no related allowance - Unpaid Principal Balance 3,429 3,941
Impaired loans with no related allowance - Average Recorded Investment 2,901 2,846
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 601 232
Impaired loans with allowance - Unpaid Principal Balance 723 241
Impaired loans with related allowance - Related Allowance 302 18
Impaired loans with related allowance - Average Recorded Investment 355 503
Real estate - mortgage - residential (1-4 family) first mortgages [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 4,514 5,205
Impaired loans with no related allowance - Unpaid Principal Balance 5,118 5,728
Impaired loans with no related allowance - Average Recorded Investment 4,885 7,067
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 10,733 9,595
Impaired loans with allowance - Unpaid Principal Balance 11,347 9,829
Impaired loans with related allowance - Related Allowance 2,756 1,099
Impaired loans with related allowance - Average Recorded Investment 9,724 10,077
Real estate - mortgage - home equity loans / lines of credit [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 23 368
Impaired loans with no related allowance - Unpaid Principal Balance 35 387
Impaired loans with no related allowance - Average Recorded Investment 138 129
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 648
Impaired loans with allowance - Unpaid Principal Balance 776
Impaired loans with related allowance - Related Allowance 415
Impaired loans with related allowance - Average Recorded Investment 216 66
Real estate - mortgage - commercial and other [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 3,494 3,066
Impaired loans with no related allowance - Unpaid Principal Balance 3,685 3,321
Impaired loans with no related allowance - Average Recorded Investment 3,441 3,143
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 6,839 5,427
Impaired loans with allowance - Unpaid Principal Balance 6,942 5,427
Impaired loans with related allowance - Related Allowance 1,231 232
Impaired loans with related allowance - Average Recorded Investment 5,856 5,369
Installment loans to individuals [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment
Impaired loans with no related allowance - Unpaid Principal Balance 3
Impaired loans with no related allowance - Average Recorded Investment
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 10
Impaired loans with allowance - Unpaid Principal Balance 15
Impaired loans with related allowance - Related Allowance 6
Impaired loans with related allowance - Average Recorded Investment $ 3