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
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