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Loans - Loans Individually Evaluated for Impairment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
With no related allowance recorded [Abstract]    
Recorded Investment $ 25,894 $ 28,796
Unpaid Principal Balance 26,397 29,137
Average Recorded Investment 27,346 29,323
Interest Income Recognized 30 256
With an allowance recorded [Abstract]    
Recorded Investment 32,544 33,742
Unpaid Principal Balance 32,964 33,850
Related Allowance 6,215 7,153
Average Recorded Investment 33,143 26,922
Interest Income Recognized 1 81
Totals [Abstract]    
Recorded Investment 58,438 62,538
Unpaid Principal Balance 59,361 62,987
Related Allowance 6,215 7,153
Average Recorded Investment 60,489 56,245
Interest Income Recognized 31 337
Commercial, financial and agricultural    
With no related allowance recorded [Abstract]    
Recorded Investment 19,185 15,101
Unpaid Principal Balance 19,688 15,428
Average Recorded Investment 17,143 18,815
Interest Income Recognized 26 191
With an allowance recorded [Abstract]    
Recorded Investment 16,161 16,372
Unpaid Principal Balance 16,344 16,470
Related Allowance 4,173 4,369
Average Recorded Investment 16,267 10,781
Interest Income Recognized 1 42
Totals [Abstract]    
Related Allowance 4,173 4,369
Real estate - construction    
With no related allowance recorded [Abstract]    
Recorded Investment 0 9
Unpaid Principal Balance 0 9
Average Recorded Investment 5 23
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 26  
Unpaid Principal Balance 26  
Related Allowance 9  
Average Recorded Investment 13  
Interest Income Recognized 0  
Totals [Abstract]    
Related Allowance 9  
Real estate - commercial    
With no related allowance recorded [Abstract]    
Recorded Investment 6,320 12,710
Unpaid Principal Balance 6,320 12,710
Average Recorded Investment 9,515 9,297
Interest Income Recognized 3 64
With an allowance recorded [Abstract]    
Recorded Investment 14,303 15,979
Unpaid Principal Balance 14,503 15,979
Related Allowance 1,656 2,216
Average Recorded Investment 15,141 14,992
Interest Income Recognized 0 28
Totals [Abstract]    
Related Allowance 1,656 2,216
Real estate - residential    
With no related allowance recorded [Abstract]    
Recorded Investment 389 903
Unpaid Principal Balance 389 903
Average Recorded Investment 646 1,134
Interest Income Recognized 1 0
With an allowance recorded [Abstract]    
Recorded Investment 1,567 923
Unpaid Principal Balance 1,567 923
Related Allowance 217 260
Average Recorded Investment 1,245 730
Interest Income Recognized 0 0
Totals [Abstract]    
Related Allowance 217 260
Installment loans to individuals    
With no related allowance recorded [Abstract]    
Recorded Investment 0 73
Unpaid Principal Balance 0 87
Average Recorded Investment 37 54
Interest Income Recognized 0 1
With an allowance recorded [Abstract]    
Recorded Investment 487 468
Unpaid Principal Balance 524 478
Related Allowance 160 308
Average Recorded Investment 477 419
Interest Income Recognized 0 11
Totals [Abstract]    
Related Allowance 160 308
Total: Commercial    
With an allowance recorded [Abstract]    
Related Allowance 5,829 6,585
Totals [Abstract]    
Recorded Investment 55,969 60,162
Unpaid Principal Balance 56,855 60,587
Related Allowance 5,829 6,585
Average Recorded Investment 58,066 53,885
Interest Income Recognized 30 325
Total: Construction    
With an allowance recorded [Abstract]    
Related Allowance 9 0
Totals [Abstract]    
Recorded Investment 26 9
Unpaid Principal Balance 26 9
Related Allowance 9 0
Average Recorded Investment 18 23
Interest Income Recognized 0 0
Total: Residential    
With an allowance recorded [Abstract]    
Related Allowance 217 260
Totals [Abstract]    
Recorded Investment 1,956 1,826
Unpaid Principal Balance 1,956 1,826
Related Allowance 217 260
Average Recorded Investment 1,891 1,864
Interest Income Recognized 1 0
Total: Consumer    
With an allowance recorded [Abstract]    
Related Allowance 160 308
Totals [Abstract]    
Recorded Investment 487 541
Unpaid Principal Balance 524 565
Related Allowance 160 308
Average Recorded Investment 514 473
Interest Income Recognized $ 0 $ 12