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
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs $ 6,898,729 $ 6,307,060 $ 6,148,918
Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 841,738 751,131 776,430
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 903,523 857,805 857,142
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,748,039 1,564,295 1,454,828
Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 368,686 334,276 339,313
Commercial & Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 554,522 551,526 509,857
Residential 1-4 Family      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,083,112 1,029,547 999,361
HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 535,446 526,884 524,097
Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 587,091 429,525 432,702
Purchased Impaired      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 51,041 59,292 62,346
Purchased Impaired | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 26,125 27,569  
Purchased Impaired | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 16,774 21,837  
Purchased Impaired | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 7,245 9,256  
Purchased Impaired | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 897 630  
Purchased Impaired | Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 3,026 2,922 3,205
Purchased Impaired | Construction and Land Development | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,460 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 1,311 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 255 398  
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 17,668 18,343 19,064
Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 5,521 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 8,237 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 3,910 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 14,376 17,303 18,141
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 10,676 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 2,435 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 1,265 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 77 2,066 2,079
Purchased Impaired | Multifamily Real Estate | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 343  
Purchased Impaired | Multifamily Real Estate | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 77 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 625 1,074 1,145
Purchased Impaired | Commercial & Industrial | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 94 107  
Purchased Impaired | Commercial & Industrial | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 309 480  
Purchased Impaired | Commercial & Industrial | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 222 487  
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 14,077 16,200 16,828
Purchased Impaired | Residential 1-4 Family | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 7,498 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 4,227 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 1,577 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 775 516  
Purchased Impaired | HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 982 1,161 1,498
Purchased Impaired | HELOC | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 722 857  
Purchased Impaired | HELOC | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 132 183  
Purchased Impaired | HELOC | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 6 7  
Purchased Impaired | HELOC | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 122 114  
Purchased Impaired | Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 210 223 $ 386
Purchased Impaired | Consumer and all other | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 154 166  
Purchased Impaired | Consumer and all other | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 46 37  
Purchased Impaired | Consumer and all other | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 10 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