Quarterly report pursuant to Section 13 or 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Excluding Purchased Impaired Loans) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Excluding Purchased Impaired Loans) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Total Loans $ 9,290,259 $ 7,141,552
Construction and Land Development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,250,448 948,791
Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,293,791 943,933
Commercial Real Estate - Non-Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,318,589 1,713,659
Multifamily Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 541,730 357,079
Commercial & Industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,093,771 612,023
Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 723,945 612,395
Residential 1-4 Family - Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 607,155 485,690
Auto    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 296,706 282,474
HELOC    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 626,916 537,521
Consumer and all other    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 537,208 647,987
Excluding Purchased Impaired    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 9,188,735 7,102,531
Excluding Purchased Impaired | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 8,908,024 6,880,526
Excluding Purchased Impaired | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 228,767 184,654
Excluding Purchased Impaired | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 51,726 34,114
Excluding Purchased Impaired | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 218 3,237
Excluding Purchased Impaired | Construction and Land Development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,245,265 945,953
Excluding Purchased Impaired | Construction and Land Development | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,175,380 869,111
Excluding Purchased Impaired | Construction and Land Development | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 57,960 62,517
Excluding Purchased Impaired | Construction and Land Development | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 11,925 14,325
Excluding Purchased Impaired | Construction and Land Development | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,267,071 929,143
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,205,921 872,130
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 50,989 52,268
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 10,161 4,745
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,293,909 1,707,049
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,245,538 1,681,314
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 41,367 19,899
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 7,004 5,836
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Excluding Purchased Impaired | Multifamily Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 541,646 356,999
Excluding Purchased Impaired | Multifamily Real Estate | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 526,392 349,625
Excluding Purchased Impaired | Multifamily Real Estate | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 15,254 7,374
Excluding Purchased Impaired | Multifamily Real Estate | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Excluding Purchased Impaired | Multifamily Real Estate | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Excluding Purchased Impaired | Commercial & Industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,091,920 611,615
Excluding Purchased Impaired | Commercial & Industrial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,056,472 595,923
Excluding Purchased Impaired | Commercial & Industrial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 33,041 13,533
Excluding Purchased Impaired | Commercial & Industrial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,407 2,159
Excluding Purchased Impaired | Commercial & Industrial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Excluding Purchased Impaired | Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 706,718 602,981
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 686,817 587,169
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 15,161 12,117
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 4,740 3,650
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 45
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 589,153 481,957
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 572,050 470,646
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 6,353 7,190
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 10,564 1,642
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 186 2,479
Excluding Purchased Impaired | Auto    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 296,695 282,474
Excluding Purchased Impaired | Auto | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 293,409 278,063
Excluding Purchased Impaired | Auto | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,531 4,131
Excluding Purchased Impaired | Auto | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 737 119
Excluding Purchased Impaired | Auto | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 18 161
Excluding Purchased Impaired | HELOC    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 620,026 536,571
Excluding Purchased Impaired | HELOC | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 613,491 531,358
Excluding Purchased Impaired | HELOC | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 3,044 3,867
Excluding Purchased Impaired | HELOC | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 3,491 857
Excluding Purchased Impaired | HELOC | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 489
Excluding Purchased Impaired | Consumer and all other    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 536,332 647,789
Excluding Purchased Impaired | Consumer and all other | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 532,554 645,187
Excluding Purchased Impaired | Consumer and all other | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 3,067 1,758
Excluding Purchased Impaired | Consumer and all other | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 697 781
Excluding Purchased Impaired | Consumer and all other | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans $ 14 $ 63