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, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs $ 12,306,997 $ 9,716,207
Construction and Land Development    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 1,201,149 1,194,821
Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 1,979,052 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 3,198,580 2,467,410
Multifamily Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 659,946 548,231
Commercial & Industrial    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 2,058,133 1,317,135
Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 721,185 640,419
Residential 1-4 Family - Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 913,245 673,909
Auto    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 328,456 301,943
HELOC    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 660,963 613,383
Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 386,848 379,694
Other Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 199,440 241,917
Purchased Impaired    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 89,735 90,221
Purchased Impaired | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 33,917 35,658
Purchased Impaired | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 28,736 21,699
Purchased Impaired | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 27,082 32,864
Purchased Impaired | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 0 0
Purchased Impaired | Construction and Land Development    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 8,387 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 1,233 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 3,993 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 3,161 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 27,817 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 8,273 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 10,845 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 8,699 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 17,285 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 3,855 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 9,533 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 3,897 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 93 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 93 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 3,262 2,156
Purchased Impaired | Commercial & Industrial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 115 762
Purchased Impaired | Commercial & Industrial | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 57 134
Purchased Impaired | Commercial & Industrial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 3,090 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 12,237 13,601
Purchased Impaired | Residential 1-4 Family - Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 6,490 6,476
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 2,780 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 2,967 4,354
Purchased Impaired | Residential 1-4 Family - Commercial | 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 - Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 14,977 16,872
Purchased Impaired | Residential 1-4 Family - Consumer | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 10,074 9,930
Purchased Impaired | Residential 1-4 Family - Consumer | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 233 1,030
Purchased Impaired | Residential 1-4 Family - Consumer | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 4,670 5,912
Purchased Impaired | Residential 1-4 Family - Consumer | 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 4,275 5,115
Purchased Impaired | HELOC | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 3,092 3,438
Purchased Impaired | HELOC | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 607 1,031
Purchased Impaired | HELOC | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 576 646
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 682 32
Purchased Impaired | Consumer | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 660 17
Purchased Impaired | Consumer | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 4 0
Purchased Impaired | Consumer | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 18 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 713 717
Purchased Impaired | Other Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 122 57
Purchased Impaired | Other Commercial | Watch & Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held for investment, net of deferred fees and costs 591 660
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