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, 2016
Dec. 31, 2015
Sep. 30, 2015
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs $ 6,148,918 $ 5,671,462 $ 5,543,621
Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 776,430 749,720 694,645
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 857,142 860,086 863,578
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,454,828 1,270,480 1,223,607
Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 339,313 322,528 329,959
Commercial & Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 509,857 435,365 409,657
Residential 1-4 Family      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 999,361 978,469 987,788
HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 524,097 516,726 514,362
Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 432,702 304,027 294,031
Purchased Impaired      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 62,346 73,737 78,606
Purchased Impaired | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 21,053 22,339  
Purchased Impaired | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 29,968 33,862  
Purchased Impaired | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 10,384 15,760  
Purchased Impaired | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 941 1,776  
Purchased Impaired | Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 3,205 5,986 7,628
Purchased Impaired | Construction and Land Development | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,102 2,059  
Purchased Impaired | Construction and Land Development | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,677 1,778  
Purchased Impaired | Construction and Land Development | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 426 1,908  
Purchased Impaired | Construction and Land Development | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 241  
Purchased Impaired | Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 19,064 27,388 28,694
Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 5,313 5,260  
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 9,036 15,530  
Purchased Impaired | Commercial Real Estate - Owner Occupied | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 4,715 6,598  
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 18,141 13,519 13,326
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 4,855 4,442  
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 11,562 7,827  
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 1,724 1,250  
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 2,079 1,555 1,943
Purchased Impaired | Multifamily Real Estate | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 347 356  
Purchased Impaired | Multifamily Real Estate | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,732 1,199  
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 1,145 1,813 2,245
Purchased Impaired | Commercial & Industrial | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 93 144  
Purchased Impaired | Commercial & Industrial | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 496 359  
Purchased Impaired | Commercial & Industrial | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 556 1,289  
Purchased Impaired | Commercial & Industrial | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 21  
Purchased Impaired | Residential 1-4 Family      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 16,828 21,159 22,379
Purchased Impaired | Residential 1-4 Family | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 8,085 9,098  
Purchased Impaired | Residential 1-4 Family | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 5,297 6,380  
Purchased Impaired | Residential 1-4 Family | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 2,941 4,605  
Purchased Impaired | Residential 1-4 Family | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 505 1,076  
Purchased Impaired | HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,498 1,791 1,812
Purchased Impaired | HELOC | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 932 923  
Purchased Impaired | HELOC | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 130 410  
Purchased Impaired | HELOC | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 20  
Purchased Impaired | HELOC | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 436 438  
Purchased Impaired | Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 386 526 $ 579
Purchased Impaired | Consumer and all other | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 326 57  
Purchased Impaired | Consumer and all other | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 38 379  
Purchased Impaired | Consumer and all other | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 22 90  
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