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Credit Quality of Loans and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
With no related allowance recorded [Abstract]    
Recorded Investment $ 71,119 $ 35,432
Unpaid Principal Balance 79,354 42,897
Average Recorded Investment 53,276 32,114
Interest Income Recognized 18 90
With an allowance recorded [Abstract]    
Recorded Investment 12,308 15,206
Unpaid Principal Balance 12,463 15,309
Related Allowance 6,164 7,370
Average Recorded Investment 13,757 24,474
Interest Income Recognized 0 1
Totals [Abstract]    
Recorded Investment 83,427 50,638
Unpaid Principal Balance 91,817 58,206
Related Allowance 6,164 7,370
Average Recorded Investment 67,033 56,588
Interest Income Recognized 18 91
Commercial, financial and agricultural    
With no related allowance recorded [Abstract]    
Recorded Investment 44,445 24,659
Unpaid Principal Balance 50,416 30,630
Average Recorded Investment 34,552 19,880
Interest Income Recognized 18 90
With an allowance recorded [Abstract]    
Recorded Investment 10,647 14,119
Unpaid Principal Balance 10,802 14,150
Related Allowance 5,968 7,197
Average Recorded Investment 12,383 15,245
Interest Income Recognized 0 1
Totals [Abstract]    
Related Allowance 5,968 7,197
Real estate - construction    
With no related allowance recorded [Abstract]    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Average Recorded Investment 0 5
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 192 66
Unpaid Principal Balance 192 136
Related Allowance 94 23
Average Recorded Investment 129 33
Interest Income Recognized 0 0
Totals [Abstract]    
Related Allowance 94 23
Real estate – commercial    
With no related allowance recorded [Abstract]    
Recorded Investment 25,250 10,471
Unpaid Principal Balance 27,514 11,965
Average Recorded Investment 17,861 11,590
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 755 657
Unpaid Principal Balance 755 657
Related Allowance 76 131
Average Recorded Investment 706 8,318
Interest Income Recognized 0 0
Totals [Abstract]    
Related Allowance 76 131
Real estate - residential    
With no related allowance recorded [Abstract]    
Recorded Investment 1,400 302
Unpaid Principal Balance 1,400 302
Average Recorded Investment 851 602
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 688 316
Unpaid Principal Balance 688 316
Related Allowance 20 5
Average Recorded Investment 502 620
Interest Income Recognized 0 0
Totals [Abstract]    
Related Allowance 20 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 26 48
Unpaid Principal Balance 26 50
Related Allowance 6 14
Average Recorded Investment 37 258
Interest Income Recognized 0 0
Totals [Abstract]    
Related Allowance 6 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 6,044 7,328
Totals [Abstract]    
Recorded Investment 81,097 49,906
Unpaid Principal Balance 89,487 57,402
Related Allowance 6,044 7,328
Average Recorded Investment 65,502 55,033
Interest Income Recognized 18 91
Total: Construction    
With an allowance recorded [Abstract]    
Related Allowance 94 23
Totals [Abstract]    
Recorded Investment 192 66
Unpaid Principal Balance 192 136
Related Allowance 94 23
Average Recorded Investment 129 38
Interest Income Recognized 0 0
Total: Residential    
With an allowance recorded [Abstract]    
Related Allowance 20 5
Totals [Abstract]    
Recorded Investment 2,088 618
Unpaid Principal Balance 2,088 618
Related Allowance 20 5
Average Recorded Investment 1,353 1,222
Interest Income Recognized 0 0
Total: Consumer    
With an allowance recorded [Abstract]    
Related Allowance 6 14
Totals [Abstract]    
Recorded Investment 50 48
Unpaid Principal Balance 50 50
Related Allowance 6 14
Average Recorded Investment 49 295
Interest Income Recognized $ 0 $ 0