Quarterly report pursuant to Section 13 or 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (PCI Loan Portfolios by Segment and Delinquency Status) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (PCI Loan Portfolios by Segment and Delinquency Status) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current $ 6,663,344 $ 6,209,924  
Total Loans 6,771,490 6,307,060 $ 5,941,098
Construction and Land Development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 790,874 744,702  
Total Loans 799,938 751,131 765,997
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 865,702 836,682  
Total Loans 888,285 857,805 831,880
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,674,857 1,544,623  
Total Loans 1,698,329 1,564,295 1,370,745
Multifamily Real Estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 364,710 332,063  
Total Loans 367,257 334,276 337,723
Commercial & Industrial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 561,750 548,702  
Total Loans 568,602 551,526 469,054
Residential 1-4 Family      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,034,795 998,448  
Total Loans 1,066,519 1,029,547 992,457
HELOC      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 528,960 520,833  
Total Loans 535,088 526,884 519,196
Consumer and all other      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 569,641 424,967  
Total Loans 573,310 429,525 409,471
Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 51,307 55,244  
Total Loans 56,167 59,292 67,170
Purchased Impaired | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 3,104 2,197  
Purchased Impaired | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,756 1,851  
Purchased Impaired | Construction and Land Development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,627 2,838  
Total Loans 2,694 2,922 5,013
Purchased Impaired | Construction and Land Development | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 67 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 16,917 17,553  
Total Loans 17,906 18,343 20,692
Purchased Impaired | Commercial Real Estate - Owner Occupied | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 339 271  
Purchased Impaired | Commercial Real Estate - Owner Occupied | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 650 519  
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 15,037 16,768  
Total Loans 16,308 17,303 18,297
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,195 409  
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 76 126  
Purchased Impaired | Multifamily Real Estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,047 2,066  
Total Loans 2,047 2,066 2,092
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 642 974  
Total Loans 751 1,074 1,354
Purchased Impaired | Commercial & Industrial | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 109 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 13,046 13,957  
Total Loans 15,087 16,200 17,805
Purchased Impaired | Residential 1-4 Family | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,138 1,298  
Purchased Impaired | Residential 1-4 Family | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 903 945  
Purchased Impaired | HELOC      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 808 865  
Total Loans 1,156 1,161 1,517
Purchased Impaired | HELOC | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 221 175  
Purchased Impaired | HELOC | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 127 121  
Purchased Impaired | Consumer and all other      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 183 223  
Total Loans 218 223 $ 400
Purchased Impaired | Consumer and all other | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 35 0  
Purchased Impaired | Consumer and all other | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due $ 0 $ 0