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, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs $ 12,220,514 $ 9,716,207
Construction and Land Development    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 1,267,712 1,194,821
Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 1,966,776 1,337,345
Commercial Real Estate - Non-Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 3,104,823 2,467,410
Multifamily Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 602,115 548,231
Commercial & Industrial    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 2,032,799 1,317,135
Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 801,703 713,750
Residential 1-4 Family - Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 850,063 600,578
Auto    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 311,858 301,943
HELOC    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 660,621 613,383
Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 383,653 379,694
Other Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 238,391 241,917
Purchased Impaired    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 101,301 90,221
Purchased Impaired | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 35,679 35,658
Purchased Impaired | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 28,806 21,699
Purchased Impaired | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 36,748 32,864
Purchased Impaired | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 68 0
Purchased Impaired | Construction and Land Development    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 12,181 8,654
Purchased Impaired | Construction and Land Development | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 1,455 1,835
Purchased Impaired | Construction and Land Development | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 4,264 1,308
Purchased Impaired | Construction and Land Development | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 6,462 5,511
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 32,628 25,644
Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 8,690 8,347
Purchased Impaired | Commercial Real Estate - Owner Occupied | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 10,453 6,685
Purchased Impaired | Commercial Real Estate - Owner Occupied | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 13,485 10,612
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 15,755 17,335
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 4,573 4,789
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 9,274 7,992
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 1,908 4,554
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 92 88
Purchased Impaired | Multifamily Real Estate | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 0 0
Purchased Impaired | Multifamily Real Estate | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 92 88
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 3,930 2,156
Purchased Impaired | Commercial & Industrial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 109 762
Purchased Impaired | Commercial & Industrial | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 94 134
Purchased Impaired | Commercial & Industrial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 3,727 1,260
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 - Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 12,675 13,707
Purchased Impaired | Residential 1-4 Family - Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 6,238 6,512
Purchased Impaired | Residential 1-4 Family - Commercial | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 2,998 2,771
Purchased Impaired | Residential 1-4 Family - Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 3,371 4,424
Purchased Impaired | Residential 1-4 Family - Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 68 0
Purchased Impaired | Residential 1-4 Family - Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 17,821 16,766
Purchased Impaired | Residential 1-4 Family - Mortgage | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 10,381 9,894
Purchased Impaired | Residential 1-4 Family - Mortgage | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 269 1,030
Purchased Impaired | Residential 1-4 Family - Mortgage | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 7,171 5,842
Purchased Impaired | Residential 1-4 Family - Mortgage | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 0 0
Purchased Impaired | Auto    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 7 7
Purchased Impaired | Auto | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 3 7
Purchased Impaired | Auto | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 0 0
Purchased Impaired | Auto | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 4 0
Purchased Impaired | Auto | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 0 0
Purchased Impaired | HELOC    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 4,869 5,115
Purchased Impaired | HELOC | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 3,502 3,438
Purchased Impaired | HELOC | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 760 1,031
Purchased Impaired | HELOC | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 607 646
Purchased Impaired | HELOC | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 0 0
Purchased Impaired | Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 689 32
Purchased Impaired | Consumer | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 676 17
Purchased Impaired | Consumer | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 0 0
Purchased Impaired | Consumer | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 13 15
Purchased Impaired | Consumer | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 0 0
Purchased Impaired | Other Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 654 717
Purchased Impaired | Other Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 52 57
Purchased Impaired | Other Commercial | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 602 660
Purchased Impaired | Other Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 0 0
Purchased Impaired | Other Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs $ 0 $ 0