LOANS AND ALLOWANCE FOR LOAN LOSSES (Purchased Impaired Commercial and Consumer Loan Portfolios by Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 6,209,924	$ 5,542,840
Total Loans	6,307,060	5,671,462	$ 5,345,996
Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	55,244	64,455
Total Loans	59,292	73,737	105,788
Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	744,702	737,958
Total Loans	751,131	749,720	656,380
Construction and Land Development | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,838	5,376
Total Loans	2,922	5,986	11,890
Commercial Real Estate - Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	836,682	826,859
Total Loans	857,805	860,086	869,200
Commercial Real Estate - Owner Occupied | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	17,553	24,837
Total Loans	18,343	27,388	31,167
Commercial Real Estate - Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,544,623	1,255,367
Total Loans	1,564,295	1,270,480	1,183,514
Commercial Real Estate - Non-Owner Occupied | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	16,768	12,562
Total Loans	17,303	13,519	25,834
Multifamily Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	332,063	320,701
Total Loans	334,276	322,528	297,366
Multifamily Real Estate | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,066	1,555
Total Loans	2,066	1,555	2,994
Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	548,702	431,916
Total Loans	551,526	435,365	374,096
Commercial and Industrial | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	974	1,583
Total Loans	1,074	1,813	3,440
Residential 1-4 Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	998,448	928,312
Total Loans	1,029,547	978,469	983,074
Residential 1-4 Family | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	13,957	17,093
Total Loans	16,200	21,159	26,619
HELOC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	520,833	509,124
Total Loans	526,884	516,726	523,341
HELOC | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	865	923
Total Loans	1,161	1,791	2,000
Consumer and all other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	424,967	301,339
Total Loans	429,525	304,027	251,212
Consumer and all other | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	223	526
Total Loans	223	526	$ 1,844
30 To 89 Days Past Due | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,197	5,025
30 To 89 Days Past Due | Construction and Land Development | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	369
30 To 89 Days Past Due | Commercial Real Estate - Owner Occupied | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	271	1,139
30 To 89 Days Past Due | Commercial Real Estate - Non-Owner Occupied | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	409	755
30 To 89 Days Past Due | Multifamily Real Estate | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
30 To 89 Days Past Due | Commercial and Industrial | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	44	209
30 To 89 Days Past Due | Residential 1-4 Family | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,298	2,143
30 To 89 Days Past Due | HELOC | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	175	410
30 To 89 Days Past Due | Consumer and all other | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Greater Than 90 Days and still Accruing | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,851	4,257
Greater Than 90 Days and still Accruing | Construction and Land Development | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	84	241
Greater Than 90 Days and still Accruing | Commercial Real Estate - Owner Occupied | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	519	1,412
Greater Than 90 Days and still Accruing | Commercial Real Estate - Non-Owner Occupied | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	126	202
Greater Than 90 Days and still Accruing | Multifamily Real Estate | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Greater Than 90 Days and still Accruing | Commercial and Industrial | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	56	21
Greater Than 90 Days and still Accruing | Residential 1-4 Family | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	945	1,923
Greater Than 90 Days and still Accruing | HELOC | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	121	458
Greater Than 90 Days and still Accruing | Consumer and all other | Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 0	$ 0