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Loans and Asset Quality Information (Schedule of Impaired Loans) (Details) - All Total Loans [Member] - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment $ 13,550 $ 19,075
Impaired loans with no related allowance - Unpaid Principal Balance 15,790 23,354
Impaired loans with no related allowance - Average Recorded Investment 16,056 24,318
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 17,745 13,665
Impaired loans with allowance - Unpaid Principal Balance 18,126 13,951
Impaired loans with related allowance - Related Allowance 2,054 1,640
Impaired loans with related allowance - Average Recorded Investment 15,705 19,645
Commercial, financial, and agricultural [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 230 593
Impaired loans with no related allowance - Unpaid Principal Balance 281 706
Impaired loans with no related allowance - Average Recorded Investment 412 816
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 274 51
Impaired loans with allowance - Unpaid Principal Balance 288 51
Impaired loans with related allowance - Related Allowance 205 7
Impaired loans with related allowance - Average Recorded Investment 163 202
Real estate - construction, land development & other land loans [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 2,716 3,221
Impaired loans with no related allowance - Unpaid Principal Balance 3,903 4,558
Impaired loans with no related allowance - Average Recorded Investment 2,969 3,641
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 729 780
Impaired loans with allowance - Unpaid Principal Balance 777 798
Impaired loans with related allowance - Related Allowance 180 184
Impaired loans with related allowance - Average Recorded Investment 754 844
Real estate - mortgage - residential (1-4 family) first mortgages [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 6,954 10,035
Impaired loans with no related allowance - Unpaid Principal Balance 7,676 12,220
Impaired loans with no related allowance - Average Recorded Investment 8,495 11,008
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 11,093 10,772
Impaired loans with allowance - Unpaid Principal Balance 11,401 11,007
Impaired loans with related allowance - Related Allowance 1,351 1,339
Impaired loans with related allowance - Average Recorded Investment 10,933 13,314
Real estate - mortgage - home equity loans / lines of credit [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 59 114
Impaired loans with no related allowance - Unpaid Principal Balance 83 146
Impaired loans with no related allowance - Average Recorded Investment 86 139
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 164 166
Impaired loans with allowance - Unpaid Principal Balance 164 166
Impaired loans with related allowance - Related Allowance 8 5
Impaired loans with related allowance - Average Recorded Investment 165 324
Real estate mortgage commercial and other [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 3,589 5,112
Impaired loans with no related allowance - Unpaid Principal Balance 3,845 5,722
Impaired loans with no related allowance - Average Recorded Investment 4,093 8,713
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment 5,485 1,896
Impaired loans with allowance - Unpaid Principal Balance 5,496 1,929
Impaired loans with related allowance - Related Allowance 310 105
Impaired loans with related allowance - Average Recorded Investment 3,690 4,912
Installment loans to individuals [Member]    
Loans with no related allowance recorded:    
Impaired loans with no related allowance - Recorded Investment 2
Impaired loans with no related allowance - Unpaid Principal Balance 2 2
Impaired loans with no related allowance - Average Recorded Investment 1 1
Loans with an allowance recorded:    
Impaired loans with allowance - Recorded Investment
Impaired loans with allowance - Unpaid Principal Balance
Impaired loans with related allowance - Related Allowance
Impaired loans with related allowance - Average Recorded Investment $ 49