LOANS AND ALLOWANCE FOR LOAN LOSSES (PCI Loan Portfolios by Segment and Delinquency Status) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 6,447,081	$ 6,209,924
Total Loans	6,554,046	6,307,060	$ 5,780,502
Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	759,944	744,702
Total Loans	770,287	751,131	776,698
Commercial Real Estate - Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	850,091	836,682
Total Loans	870,559	857,805	849,202
Commercial Real Estate - Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,610,046	1,544,623
Total Loans	1,631,767	1,564,295	1,296,251
Multifamily Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	351,711	332,063
Total Loans	353,769	334,276	323,270
Commercial & Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	572,010	548,702
Total Loans	576,567	551,526	453,208
Residential 1-4 Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,021,268	998,448
Total Loans	1,057,439	1,029,547	978,478
HELOC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	522,270	520,833
Total Loans	527,863	526,884	517,122
Consumer and all other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	490,463	424,967
Total Loans	494,329	429,525	344,536
Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	52,357	55,244
Total Loans	57,770	59,292	70,105
Purchased Impaired | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,888	2,197
Purchased Impaired | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,525	1,851
Purchased Impaired | Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,704	2,838
Total Loans	2,776	2,922	5,137
Purchased Impaired | Construction and Land Development | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	72	0
Purchased Impaired | Construction and Land Development | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	84
Purchased Impaired | Commercial Real Estate - Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	16,980	17,553
Total Loans	18,199	18,343	27,260
Purchased Impaired | Commercial Real Estate - Owner Occupied | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	902	271
Purchased Impaired | Commercial Real Estate - Owner Occupied | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	317	519
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	15,397	16,768
Total Loans	16,725	17,303	13,636
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	303	409
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,025	126
Purchased Impaired | Multifamily Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,058	2,066
Total Loans	2,058	2,066	2,132
Purchased Impaired | Multifamily Real Estate | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Purchased Impaired | Multifamily Real Estate | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Purchased Impaired | Commercial & Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	721	974
Total Loans	733	1,074	1,571
Purchased Impaired | Commercial & Industrial | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	44
Purchased Impaired | Commercial & Industrial | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	12	56
Purchased Impaired | Residential 1-4 Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	13,362	13,957
Total Loans	15,910	16,200	18,305
Purchased Impaired | Residential 1-4 Family | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,491	1,298
Purchased Impaired | Residential 1-4 Family | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,057	945
Purchased Impaired | HELOC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	922	865
Total Loans	1,156	1,161	1,535
Purchased Impaired | HELOC | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	120	175
Purchased Impaired | HELOC | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	114	121
Purchased Impaired | Consumer and all other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	213	223
Total Loans	213	223	$ 529
Purchased Impaired | Consumer and all other | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Purchased Impaired | Consumer and all other | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 0	$ 0