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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, 2016
Dec. 31, 2015
With no related allowance recorded [Abstract]    
Recorded Investment $ 34,868 $ 29,851
Unpaid Principal Balance 35,152 30,135
Average Recorded Investment 32,360 16,442
Interest Income Recognized 322 859
With an allowance recorded [Abstract]    
Recorded Investment 24,511 20,101
Unpaid Principal Balance 24,525 21,299
Related Allowance 4,152 2,927
Average Recorded Investment 22,307 13,807
Interest Income Recognized 594 314
Totals [Abstract]    
Recorded Investment 59,379 49,952
Unpaid Principal Balance 59,677 51,434
Related Allowance 4,152 2,927
Average Recorded Investment 54,667 30,249
Interest Income Recognized 916 1,173
Commercial, financial and agricultural    
With no related allowance recorded [Abstract]    
Recorded Investment 26,064 22,529
Unpaid Principal Balance 26,328 22,793
Average Recorded Investment 24,297 11,484
Interest Income Recognized 267 745
With an allowance recorded [Abstract]    
Recorded Investment 3,033 5,189
Unpaid Principal Balance 3,033 6,373
Related Allowance 1,021 961
Average Recorded Investment 4,111 3,704
Interest Income Recognized 374 138
Totals [Abstract]    
Related Allowance 1,021 961
Commercial real estate - construction    
With no related allowance recorded [Abstract]    
Recorded Investment 35 37
Unpaid Principal Balance 35 37
Average Recorded Investment 36 45
Interest Income Recognized 0 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
Commercial real estate - other    
With no related allowance recorded [Abstract]    
Recorded Investment 7,564 5,886
Unpaid Principal Balance 7,564 5,886
Average Recorded Investment 6,725 3,903
Interest Income Recognized 45 97
With an allowance recorded [Abstract]    
Recorded Investment 19,947 14,004
Unpaid Principal Balance 19,947 14,004
Related Allowance 2,586 1,585
Average Recorded Investment 16,976 9,236
Interest Income Recognized 208 161
Totals [Abstract]    
Related Allowance 2,586 1,585
Residential - prime    
With no related allowance recorded [Abstract]    
Recorded Investment 1,181 1,365
Unpaid Principal Balance 1,201 1,385
Average Recorded Investment 1,273 954
Interest Income Recognized 10 17
With an allowance recorded [Abstract]    
Recorded Investment 1,049 538
Unpaid Principal Balance 1,049 538
Related Allowance 267 160
Average Recorded Investment 794 533
Interest Income Recognized 7 7
Totals [Abstract]    
Related Allowance 267 160
Consumer - other    
With no related allowance recorded [Abstract]    
Recorded Investment 24 34
Unpaid Principal Balance 24 34
Average Recorded Investment 29 56
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 482 370
Unpaid Principal Balance 496 384
Related Allowance 278 221
Average Recorded Investment 426 334
Interest Income Recognized 5 8
Totals [Abstract]    
Related Allowance 278 221
Total: Commercial    
With an allowance recorded [Abstract]    
Related Allowance 3,607 2,546
Totals [Abstract]    
Recorded Investment 56,643 47,645
Unpaid Principal Balance 56,907 49,093
Related Allowance 3,607 2,546
Average Recorded Investment 52,145 28,372
Interest Income Recognized 894 1,141
Total: Residential    
With an allowance recorded [Abstract]    
Related Allowance 267 160
Totals [Abstract]    
Recorded Investment 2,230 1,903
Unpaid Principal Balance 2,250 1,923
Related Allowance 267 160
Average Recorded Investment 2,067 1,487
Interest Income Recognized 17 24
Total: Consumer    
With an allowance recorded [Abstract]    
Related Allowance 278 221
Totals [Abstract]    
Recorded Investment 506 404
Unpaid Principal Balance 520 418
Related Allowance 278 221
Average Recorded Investment 455 390
Interest Income Recognized $ 5 $ 8