LOANS AND ALLOWANCE FOR LOAN LOSSES (PCI Loan Portfolios by Segment and Delinquency Status) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 6,793,302	$ 6,209,924
Total Loans	6,898,729	6,307,060	$ 6,148,918
Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	825,666	744,702
Total Loans	841,738	751,131	776,430
Commercial Real Estate - Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	880,575	836,682
Total Loans	903,523	857,805	857,142
Commercial Real Estate - Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,729,184	1,544,623
Total Loans	1,748,039	1,564,295	1,454,828
Multifamily Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	368,609	332,063
Total Loans	368,686	334,276	339,313
Commercial & Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	550,731	548,702
Total Loans	554,522	551,526	509,857
Residential 1-4 Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,053,440	998,448
Total Loans	1,083,112	1,029,547	999,361
HELOC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	529,936	520,833
Total Loans	535,446	526,884	524,097
Consumer and all other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	581,614	424,967
Total Loans	587,091	429,525	432,702
Purchased Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	46,155	55,244
Total Loans	51,041	59,292	62,346
Purchased Impaired | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,958	2,197
Purchased Impaired | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,928	1,851
Purchased Impaired | Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,964	2,838
Total Loans	3,026	2,922	3,205
Purchased Impaired | Construction and Land Development | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	62	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	16,562	17,553
Total Loans	17,668	18,343	19,064
Purchased Impaired | Commercial Real Estate - Owner Occupied | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	463	271
Purchased Impaired | Commercial Real Estate - Owner Occupied | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	643	519
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	13,026	16,768
Total Loans	14,376	17,303	18,141
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	318	409
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,032	126
Purchased Impaired | Multifamily Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	77	2,066
Total Loans	77	2,066	2,079
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	625	974
Total Loans	625	1,074	1,145
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	0	56
Purchased Impaired | Residential 1-4 Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	12,003	13,957
Total Loans	14,077	16,200	16,828
Purchased Impaired | Residential 1-4 Family | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	949	1,298
Purchased Impaired | Residential 1-4 Family | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,125	945
Purchased Impaired | HELOC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	722	865
Total Loans	982	1,161	1,498
Purchased Impaired | HELOC | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	132	175
Purchased Impaired | HELOC | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	128	121
Purchased Impaired | Consumer and all other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	176	223
Total Loans	210	223	$ 386
Purchased Impaired | Consumer and all other | 30 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	34	0
Purchased Impaired | Consumer and all other | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 0	$ 0