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Credit Quality of Loans and Allowance for Loan Losses - Schedule of Loans Evaluated for Impairment (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
With no related allowance recorded [Abstract]    
Recorded Investment $ 59,995 $ 35,432
Unpaid Principal Balance 65,805 42,897
Average Recorded Investment 47,713 32,114
Interest Income Recognized 32 90
With an allowance recorded [Abstract]    
Recorded Investment 14,555 15,206
Unpaid Principal Balance 17,292 15,309
Related Allowance 4,838 7,370
Average Recorded Investment 14,880 24,474
Interest Income Recognized 0 1
Totals [Abstract]    
Recorded Investment 74,550 50,638
Unpaid Principal Balance 83,097 58,206
Related Allowance 4,838 7,370
Average Recorded Investment 62,593 56,588
Interest Income Recognized 32 91
Commercial, financial and agricultural    
With no related allowance recorded [Abstract]    
Recorded Investment 28,188 24,659
Unpaid Principal Balance 32,776 30,630
Average Recorded Investment 26,424 19,880
Interest Income Recognized 32 90
With an allowance recorded [Abstract]    
Recorded Investment 12,040 14,119
Unpaid Principal Balance 13,959 14,150
Related Allowance 4,452 7,197
Average Recorded Investment 13,079 15,245
Interest Income Recognized 0 1
Totals [Abstract]    
Related Allowance 4,452 7,197
Real estate - construction    
With no related allowance recorded [Abstract]    
Recorded Investment 1,164 0
Unpaid Principal Balance 1,164 0
Average Recorded Investment 582 5
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 367 66
Unpaid Principal Balance 367 136
Related Allowance 49 23
Average Recorded Investment 216 33
Interest Income Recognized 0 0
Totals [Abstract]    
Related Allowance 49 23
Real estate – commercial    
With no related allowance recorded [Abstract]    
Recorded Investment 29,020 10,471
Unpaid Principal Balance 30,242 11,965
Average Recorded Investment 19,745 11,590
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 897 657
Unpaid Principal Balance 1,028 657
Related Allowance 126 131
Average Recorded Investment 777 8,318
Interest Income Recognized 0 0
Totals [Abstract]    
Related Allowance 126 131
Real estate - residential    
With no related allowance recorded [Abstract]    
Recorded Investment 1,599 302
Unpaid Principal Balance 1,599 302
Average Recorded Investment 950 602
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 1,210 316
Unpaid Principal Balance 1,897 316
Related Allowance 198 5
Average Recorded Investment 763 620
Interest Income Recognized 0 0
Totals [Abstract]    
Related Allowance 198 5
Installment loans to individuals    
With no related allowance recorded [Abstract]    
Recorded Investment 24 0
Unpaid Principal Balance 24 0
Average Recorded Investment 12 37
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 41 48
Unpaid Principal Balance 41 50
Related Allowance 13 14
Average Recorded Investment 45 258
Interest Income Recognized 0 0
Totals [Abstract]    
Related Allowance 13 14
Finance leases    
With no related allowance recorded [Abstract]    
Recorded Investment 0  
Unpaid Principal Balance 0  
Average Recorded Investment 0  
Interest Income Recognized 0  
With an allowance recorded [Abstract]    
Recorded Investment 0  
Unpaid Principal Balance 0  
Related Allowance 0  
Average Recorded Investment 0  
Interest Income Recognized 0  
Totals [Abstract]    
Related Allowance 0  
Total: Commercial    
With an allowance recorded [Abstract]    
Related Allowance 4,578 7,328
Totals [Abstract]    
Recorded Investment 70,145 49,906
Unpaid Principal Balance 78,005 57,402
Related Allowance 4,578 7,328
Average Recorded Investment 60,025 55,033
Interest Income Recognized 32 91
Total: Construction    
With an allowance recorded [Abstract]    
Related Allowance 49 23
Totals [Abstract]    
Recorded Investment 1,531 66
Unpaid Principal Balance 1,531 136
Related Allowance 49 23
Average Recorded Investment 798 38
Interest Income Recognized 0 0
Total: Residential    
With an allowance recorded [Abstract]    
Related Allowance 198 5
Totals [Abstract]    
Recorded Investment 2,809 618
Unpaid Principal Balance 3,496 618
Related Allowance 198 5
Average Recorded Investment 1,713 1,222
Interest Income Recognized 0 0
Total: Consumer    
With an allowance recorded [Abstract]    
Related Allowance 13 14
Totals [Abstract]    
Recorded Investment 65 48
Unpaid Principal Balance 65 50
Related Allowance 13 14
Average Recorded Investment 57 295
Interest Income Recognized $ 0 $ 0