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
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs $ 6,771,490 $ 6,307,060 $ 5,941,098
Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 799,938 751,131 765,997
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 888,285 857,805 831,880
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,698,329 1,564,295 1,370,745
Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 367,257 334,276 337,723
Commercial & Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 568,602 551,526 469,054
Residential 1-4 Family      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,066,519 1,029,547 992,457
HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 535,088 526,884 519,196
Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 573,310 429,525 409,471
Purchased Impaired      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 56,167 59,292 67,170
Purchased Impaired | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 28,689 27,569  
Purchased Impaired | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 18,835 21,837  
Purchased Impaired | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 7,649 9,256  
Purchased Impaired | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 994 630  
Purchased Impaired | Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 2,694 2,922 5,013
Purchased Impaired | Construction and Land Development | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,121 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 1,297 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 276 398  
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 17,906 18,343 20,692
Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 5,617 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 8,337 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 3,952 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 16,308 17,303 18,297
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 12,807 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 2,230 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 1,271 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 2,047 2,066 2,092
Purchased Impaired | Multifamily Real Estate | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 338 343  
Purchased Impaired | Multifamily Real Estate | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,709 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 751 1,074 1,354
Purchased Impaired | Commercial & Industrial | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 105 107  
Purchased Impaired | Commercial & Industrial | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 368 480  
Purchased Impaired | Commercial & Industrial | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 278 487  
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 15,087 16,200 17,805
Purchased Impaired | Residential 1-4 Family | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 7,735 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 4,624 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 1,850 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 878 516  
Purchased Impaired | HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,156 1,161 1,517
Purchased Impaired | HELOC | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 808 857  
Purchased Impaired | HELOC | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 221 183  
Purchased Impaired | HELOC | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 11 7  
Purchased Impaired | HELOC | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 116 114  
Purchased Impaired | Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 218 223 $ 400
Purchased Impaired | Consumer and all other | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 158 166  
Purchased Impaired | Consumer and all other | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 49 37  
Purchased Impaired | Consumer and all other | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 11 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