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Credit Quality of Loans and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
With no related allowance recorded [Abstract]    
Recorded Investment $ 36,986 $ 29,851
Unpaid Principal Balance 37,469 30,135
Average Recorded Investment 35,927 16,442
Interest Income Recognized 534 859
With an allowance recorded [Abstract]    
Recorded Investment 22,821 20,101
Unpaid Principal Balance 22,835 21,299
Related Allowance 3,803 2,927
Average Recorded Investment 23,450 13,807
Interest Income Recognized 43 314
Totals [Abstract]    
Recorded Investment 59,807 49,952
Unpaid Principal Balance 60,304 51,434
Related Allowance 3,803 2,927
Average Recorded Investment 59,377 30,249
Interest Income Recognized 577 1,173
Commercial, financial and agricultural    
With no related allowance recorded [Abstract]    
Recorded Investment 26,830 22,529
Unpaid Principal Balance 27,313 22,793
Average Recorded Investment 26,447 11,484
Interest Income Recognized 127 745
With an allowance recorded [Abstract]    
Recorded Investment 2,858 5,189
Unpaid Principal Balance 2,858 6,373
Related Allowance 1,027 961
Average Recorded Investment 2,729 3,704
Interest Income Recognized 14 138
Totals [Abstract]    
Related Allowance 1,027 961
Real estate - construction    
With no related allowance recorded [Abstract]    
Recorded Investment 34 37
Unpaid Principal Balance 34 37
Average Recorded Investment 34 45
Interest Income Recognized 0 0
Real estate - commercial    
With no related allowance recorded [Abstract]    
Recorded Investment 8,743 5,886
Unpaid Principal Balance 8,743 5,886
Average Recorded Investment 8,154 3,903
Interest Income Recognized 404 97
With an allowance recorded [Abstract]    
Recorded Investment 18,549 14,004
Unpaid Principal Balance 18,549 14,004
Related Allowance 2,260 1,585
Average Recorded Investment 19,248 9,236
Interest Income Recognized 28 161
Totals [Abstract]    
Related Allowance 2,260 1,585
Real estate - residential    
With no related allowance recorded [Abstract]    
Recorded Investment 1,349 1,365
Unpaid Principal Balance 1,349 1,385
Average Recorded Investment 1,265 954
Interest Income Recognized 3 17
With an allowance recorded [Abstract]    
Recorded Investment 973 538
Unpaid Principal Balance 973 538
Related Allowance 251 160
Average Recorded Investment 1,011 533
Interest Income Recognized 0 7
Totals [Abstract]    
Related Allowance 251 160
Installment loans to individuals    
With no related allowance recorded [Abstract]    
Recorded Investment 30 34
Unpaid Principal Balance 30 34
Average Recorded Investment 27 56
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 441 370
Unpaid Principal Balance 455 384
Related Allowance 265 221
Average Recorded Investment 462 334
Interest Income Recognized 1 8
Totals [Abstract]    
Recorded Investment 471 404
Unpaid Principal Balance 485 418
Related Allowance 265 221
Average Recorded Investment 489 390
Interest Income Recognized 1 8
Total: Commercial    
With an allowance recorded [Abstract]    
Related Allowance 3,287 2,546
Totals [Abstract]    
Recorded Investment 56,980 47,608
Unpaid Principal Balance 57,463 49,056
Related Allowance 3,287 2,546
Average Recorded Investment 56,578 28,327
Interest Income Recognized 573 1,141
Total: Construction    
With an allowance recorded [Abstract]    
Related Allowance 0 0
Totals [Abstract]    
Recorded Investment 34 37
Unpaid Principal Balance 34 37
Related Allowance 0 0
Average Recorded Investment 34 45
Interest Income Recognized 0 0
Real estate - residential    
With an allowance recorded [Abstract]    
Related Allowance 251 160
Totals [Abstract]    
Recorded Investment 2,322 1,903
Unpaid Principal Balance 2,322 1,923
Related Allowance 251 160
Average Recorded Investment 2,276 1,487
Interest Income Recognized $ 3 $ 24