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)

v3.10.0.1
LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Including Purchased Impaired Loans) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment $ 9,290,259 $ 7,141,552
Construction and Land Development    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 1,250,448 948,791
Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 1,293,791 943,933
Commercial Real Estate - Non-Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 2,318,589 1,713,659
Multifamily Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 541,730 357,079
Commercial & Industrial    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 1,093,771 612,023
Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 723,945 612,395
Residential 1-4 Family - Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 607,155 485,690
Auto    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 296,706 282,474
HELOC    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 626,916 537,521
Consumer and all other    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 537,208 647,987
Purchased Impaired    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 101,524 39,021
Purchased Impaired | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 32,645 19,017
Purchased Impaired | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 43,711 13,881
Purchased Impaired | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 25,138 5,435
Purchased Impaired | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 30 688
Purchased Impaired | Construction and Land Development    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 5,183 2,838
Purchased Impaired | Construction and Land Development | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 1,784 1,462
Purchased Impaired | Construction and Land Development | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 1,286 1,260
Purchased Impaired | Construction and Land Development | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 2,113 116
Purchased Impaired | Construction and Land Development | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 0 0
Purchased Impaired | Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 26,720 14,790
Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 3,643 4,958
Purchased Impaired | Commercial Real Estate - Owner Occupied | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 16,444 7,486
Purchased Impaired | Commercial Real Estate - Owner Occupied | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 6,633 2,346
Purchased Impaired | Commercial Real Estate - Owner Occupied | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 0 0
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 24,680 6,610
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 3,507 3,920
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 16,103 1,394
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 5,070 1,296
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 0 0
Purchased Impaired | Multifamily Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 84 80
Purchased Impaired | Multifamily Real Estate | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 0 0
Purchased Impaired | Multifamily Real Estate | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 84 80
Purchased Impaired | Multifamily Real Estate | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 0 0
Purchased Impaired | Multifamily Real Estate | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 0 0
Purchased Impaired | Commercial & Industrial    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 1,851 408
Purchased Impaired | Commercial & Industrial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 871 85
Purchased Impaired | Commercial & Industrial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 210 123
Purchased Impaired | Commercial & Industrial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 770 200
Purchased Impaired | Commercial & Industrial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 0 0
Purchased Impaired | Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 17,227 9,414
Purchased Impaired | Residential 1-4 Family - Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 6,467 5,234
Purchased Impaired | Residential 1-4 Family - Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 7,235 2,877
Purchased Impaired | Residential 1-4 Family - Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 3,525 1,303
Purchased Impaired | Residential 1-4 Family - Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 0 0
Purchased Impaired | Residential 1-4 Family - Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 18,002 3,733
Purchased Impaired | Residential 1-4 Family - Mortgage | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 11,661 2,764
Purchased Impaired | Residential 1-4 Family - Mortgage | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 768 329
Purchased Impaired | Residential 1-4 Family - Mortgage | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 5,573 71
Purchased Impaired | Residential 1-4 Family - Mortgage | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 0 569
Purchased Impaired | Auto    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 11 0
Purchased Impaired | Auto | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 11  
Purchased Impaired | Auto | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 0  
Purchased Impaired | Auto | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 0  
Purchased Impaired | Auto | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 0  
Purchased Impaired | HELOC    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 6,890 950
Purchased Impaired | HELOC | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 4,611 446
Purchased Impaired | HELOC | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 854 291
Purchased Impaired | HELOC | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 1,395 94
Purchased Impaired | HELOC | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 30 119
Purchased Impaired | Consumer and all other    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 876 198
Purchased Impaired | Consumer and all other | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 90 148
Purchased Impaired | Consumer and all other | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 727 41
Purchased Impaired | Consumer and all other | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment 59 9
Purchased Impaired | Consumer and all other | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Net loans held for investment $ 0 $ 0