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, 2016
Dec. 31, 2015
Jun. 30, 2015
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs $ 5,941,098 $ 5,671,462 $ 5,510,385
Construction and Land Development [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 765,997 749,720 671,234
Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 831,880 860,086 874,582
Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,370,745 1,270,480 1,217,646
Multifamily Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 337,723 322,528 316,474
Commercial & Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 469,054 435,365 426,193
Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 992,457 978,469 991,592
HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 519,196 516,726 512,123
Consumer and all other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 409,471 304,027 284,121
Purchased Impaired [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 67,170 73,737 87,841
Purchased Impaired [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 21,986 22,339  
Purchased Impaired [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 32,386 33,862  
Purchased Impaired [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 11,507 15,760  
Purchased Impaired [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,291 1,776  
Purchased Impaired [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 5,013 5,986 8,397
Purchased Impaired [Member] | Construction and Land Development [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,071 2,059  
Purchased Impaired [Member] | Construction and Land Development [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 2,432 1,778  
Purchased Impaired [Member] | Construction and Land Development [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,269 1,908  
Purchased Impaired [Member] | Construction and Land Development [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 241 241  
Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 20,692 27,388 29,838
Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 5,407 5,260  
Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 9,813 15,530  
Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 5,472 6,598  
Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 0  
Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 18,297 13,519 16,982
Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 5,335 4,442  
Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 12,400 7,827  
Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 562 1,250  
Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 0  
Purchased Impaired [Member] | Multifamily Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 2,092 1,555 3,004
Purchased Impaired [Member] | Multifamily Real Estate [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 350 356  
Purchased Impaired [Member] | Multifamily Real Estate [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,742 1,199  
Purchased Impaired [Member] | Multifamily Real Estate [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 0  
Purchased Impaired [Member] | Multifamily Real Estate [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 0  
Purchased Impaired [Member] | Commercial & Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,354 1,813 2,940
Purchased Impaired [Member] | Commercial & Industrial [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 104 144  
Purchased Impaired [Member] | Commercial & Industrial [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 434 359  
Purchased Impaired [Member] | Commercial & Industrial [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 816 1,289  
Purchased Impaired [Member] | Commercial & Industrial [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 0 21  
Purchased Impaired [Member] | Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 17,805 21,159 24,157
Purchased Impaired [Member] | Residential 1-4 Family [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 8,677 9,098  
Purchased Impaired [Member] | Residential 1-4 Family [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 5,224 6,380  
Purchased Impaired [Member] | Residential 1-4 Family [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 3,285 4,605  
Purchased Impaired [Member] | Residential 1-4 Family [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 619 1,076  
Purchased Impaired [Member] | HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 1,517 1,791 1,840
Purchased Impaired [Member] | HELOC [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 861 923  
Purchased Impaired [Member] | HELOC [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 146 410  
Purchased Impaired [Member] | HELOC [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 79 20  
Purchased Impaired [Member] | HELOC [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 431 438  
Purchased Impaired [Member] | Consumer and all other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 400 526 $ 683
Purchased Impaired [Member] | Consumer and all other [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 181 57  
Purchased Impaired [Member] | Consumer and all other [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 195 379  
Purchased Impaired [Member] | Consumer and all other [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs 24 90  
Purchased Impaired [Member] | Consumer and all other [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans held for investment, net of deferred fees and costs $ 0 $ 0