Quarterly report pursuant to Section 13 or 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Including Purchased Impaired Loans) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Including Purchased Impaired Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs $ 6,554,046 $ 6,307,060 $ 5,780,502
Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 770,287 751,131 776,698
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 870,559 857,805 849,202
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,631,767 1,564,295 1,296,251
Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 353,769 334,276 323,270
Commercial & Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 576,567 551,526 453,208
Residential 1-4 Family      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,057,439 1,029,547 978,478
HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 527,863 526,884 517,122
Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 494,329 429,525 344,536
Purchased Impaired      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 57,770 59,292 70,105
Purchased Impaired | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 27,122 27,569  
Purchased Impaired | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 21,615 21,837  
Purchased Impaired | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 8,130 9,256  
Purchased Impaired | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 903 630  
Purchased Impaired | Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 2,776 2,922 5,137
Purchased Impaired | Construction and Land Development | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,096 1,092  
Purchased Impaired | Construction and Land Development | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,394 1,432  
Purchased Impaired | Construction and Land Development | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 286 398  
Purchased Impaired | Construction and Land Development | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 0  
Purchased Impaired | Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 18,199 18,343 27,260
Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 5,417 5,520  
Purchased Impaired | Commercial Real Estate - Owner Occupied | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 8,902 8,889  
Purchased Impaired | Commercial Real Estate - Owner Occupied | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 3,880 3,934  
Purchased Impaired | Commercial Real Estate - Owner Occupied | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 0  
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 16,725 17,303 13,636
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 11,014 10,927  
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 4,323 4,638  
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,388 1,738  
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 0  
Purchased Impaired | Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 2,058 2,066 2,132
Purchased Impaired | Multifamily Real Estate | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 342 343  
Purchased Impaired | Multifamily Real Estate | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,716 1,723  
Purchased Impaired | Multifamily Real Estate | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 0  
Purchased Impaired | Multifamily Real Estate | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 0  
Purchased Impaired | Commercial & Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 733 1,074 1,571
Purchased Impaired | Commercial & Industrial | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 98 107  
Purchased Impaired | Commercial & Industrial | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 360 480  
Purchased Impaired | Commercial & Industrial | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 275 487  
Purchased Impaired | Commercial & Industrial | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 0  
Purchased Impaired | Residential 1-4 Family      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 15,910 16,200 18,305
Purchased Impaired | Residential 1-4 Family | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 8,079 8,557  
Purchased Impaired | Residential 1-4 Family | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 4,740 4,455  
Purchased Impaired | Residential 1-4 Family | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 2,301 2,672  
Purchased Impaired | Residential 1-4 Family | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 790 516  
Purchased Impaired | HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,156 1,161 1,535
Purchased Impaired | HELOC | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 915 857  
Purchased Impaired | HELOC | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 128 183  
Purchased Impaired | HELOC | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 7  
Purchased Impaired | HELOC | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 113 114  
Purchased Impaired | Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 213 223 $ 529
Purchased Impaired | Consumer and all other | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 161 166  
Purchased Impaired | Consumer and all other | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 52 37  
Purchased Impaired | Consumer and all other | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 20  
Purchased Impaired | Consumer and all other | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs $ 0 $ 0