LOANS AND ALLOWANCE FOR LOAN LOSSES (Summary of Aging of the Loan Portfolio by Segment) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater than 90 Days and still Accruing	$ 3,625	$ 3,005
Total Loans	6,771,490	6,307,060	$ 5,941,098
Nonaccrual	24,574	9,973
Current	6,663,344	6,209,924
Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	56,167	59,292	67,170
Current	51,307	55,244
30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	14,767	20,245
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	9,013	4,621
Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater than 90 Days and still Accruing	83	76
Total Loans	799,938	751,131	765,997
Nonaccrual	5,659	2,037
Current	790,874	744,702
Construction and Land Development | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	2,694	2,922	5,013
Current	2,627	2,838
Construction and Land Development | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	602	1,162
Construction and Land Development | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	26	232
Commercial Real Estate - Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater than 90 Days and still Accruing	56	35
Total Loans	888,285	857,805	831,880
Nonaccrual	1,279	794
Current	865,702	836,682
Commercial Real Estate - Owner Occupied | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	17,906	18,343	20,692
Current	16,917	17,553
Commercial Real Estate - Owner Occupied | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,148	1,842
Commercial Real Estate - Owner Occupied | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	194	109
Commercial Real Estate - Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater than 90 Days and still Accruing	298	0
Total Loans	1,698,329	1,564,295	1,370,745
Nonaccrual	4,765	0
Current	1,674,857	1,544,623
Commercial Real Estate - Non-Owner Occupied | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	16,308	17,303	18,297
Current	15,037	16,768
Commercial Real Estate - Non-Owner Occupied | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,530	2,369
Commercial Real Estate - Non-Owner Occupied | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	571	0
Multifamily Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater than 90 Days and still Accruing	0	0
Total Loans	367,257	334,276	337,723
Nonaccrual	0	0
Current	364,710	332,063
Multifamily Real Estate | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	2,047	2,066	2,092
Current	2,047	2,066
Multifamily Real Estate | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	500	147
Multifamily Real Estate | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial & Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater than 90 Days and still Accruing	55	9
Total Loans	568,602	551,526	469,054
Nonaccrual	4,281	124
Current	561,750	548,702
Commercial & Industrial | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	751	1,074	1,354
Current	642	974
Commercial & Industrial | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,652	759
Commercial & Industrial | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	113	858
Residential 1-4 Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater than 90 Days and still Accruing	2,369	2,048
Total Loans	1,066,519	1,029,547	992,457
Nonaccrual	6,128	5,279
Current	1,034,795	998,448
Residential 1-4 Family | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	15,087	16,200	17,805
Current	13,046	13,957
Residential 1-4 Family | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,477	7,038
Residential 1-4 Family | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5,663	534
Auto
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater than 90 Days and still Accruing	35	111
Total Loans	274,162	262,071	244,575
Nonaccrual	270	169
Current	272,055	258,904
Auto | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0	0
Auto | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,562	2,570
Auto | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	240	317
HELOC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater than 90 Days and still Accruing	544	635
Total Loans	535,088	526,884	519,196
Nonaccrual	2,059	1,279
Current	528,960	520,833
HELOC | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,156	1,161	1,517
Current	808	865
HELOC | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,405	1,836
HELOC | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	964	1,140
Consumer and all other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater than 90 Days and still Accruing	185	91
Total Loans	573,310	429,525	409,471
Nonaccrual	133	291
Current	569,641	424,967
Consumer and all other | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	218	223	$ 400
Current	183	223
Consumer and all other | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,891	2,522
Consumer and all other | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 1,242	$ 1,431