LOANS - Risk Category, Class of Loans and Recorded Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 3,384,991	$ 2,879,536
Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	245,151	160,116
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,478,092	1,357,592
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	941,169	836,787
Commercial and Financial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	535,457	370,589
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	185,122	154,452
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,302,442	2,797,806
Pass [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	232,183	148,563
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,442,538	1,319,696
Pass [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	917,500	811,576
Pass [Member] | Commercial and Financial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	527,190	364,241
Pass [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	183,031	153,730
Special mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	26,571	28,017
Special mention [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	8,844	5,037
Special mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	11,534	17,184
Special mention [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,317	1,780
Special mention [Member] | Commercial and Financial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,414	3,949
Special mention [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,462	67
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	25,422	17,931
Substandard [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,439	5,497
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	14,466	7,438
Substandard [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,966	2,709
Substandard [Member] | Commercial and Financial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,328	2,153
Substandard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	223	134
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful [Member] | Commercial and Financial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Doubtful [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	14,375	18,071
Nonaccrual [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	436	470
Nonaccrual [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,801	7,341
Nonaccrual [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	9,504	9,844
Nonaccrual [Member] | Commercial and Financial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	525	246
Nonaccrual [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	109	170
restructures [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,909	5,434
restructures [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	33	44
restructures [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,876	4,988
restructures [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	358
restructures [Member] | Commercial and Financial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
restructures [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	44
Troubled debt restructures [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	11,272	12,277
Troubled debt restructures [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	216	505
Troubled debt restructures [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	877	945
Troubled debt restructures [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	9,882	10,520
Troubled debt restructures [Member] | Commercial and Financial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Troubled debt restructures [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 297	$ 307