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
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Total Loans $ 9,411,598 $ 7,141,552
Construction and Land Development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,178,054 948,791
Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,283,125 943,933
Commercial Real Estate - Non-Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,427,251 1,713,659
Multifamily Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 542,662 357,079
Commercial & Industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,154,583 612,023
Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 719,798 612,395
Residential 1-4 Family - Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 611,728 485,690
Auto    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 306,196 282,474
HELOC    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 612,116 537,521
Consumer and all other    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 576,085 647,987
Excluding Purchased Impaired    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 9,316,852 7,102,531
Excluding Purchased Impaired | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 9,051,611 6,880,526
Excluding Purchased Impaired | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 187,078 184,654
Excluding Purchased Impaired | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 78,028 34,114
Excluding Purchased Impaired | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 135 3,237
Excluding Purchased Impaired | Construction and Land Development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,173,012 945,953
Excluding Purchased Impaired | Construction and Land Development | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,112,422 869,111
Excluding Purchased Impaired | Construction and Land Development | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 49,278 62,517
Excluding Purchased Impaired | Construction and Land Development | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 11,299 14,325
Excluding Purchased Impaired | Construction and Land Development | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 13 0
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,257,229 929,143
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,191,608 872,130
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 37,261 52,268
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 28,360 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 2,405,676 1,707,049
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,377,408 1,681,314
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 22,536 19,899
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 5,732 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 542,576 356,999
Excluding Purchased Impaired | Multifamily Real Estate | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 530,613 349,625
Excluding Purchased Impaired | Multifamily Real Estate | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 11,963 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 1,152,284 611,615
Excluding Purchased Impaired | Commercial & Industrial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,107,669 595,923
Excluding Purchased Impaired | Commercial & Industrial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 36,496 13,533
Excluding Purchased Impaired | Commercial & Industrial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 8,119 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 703,725 602,981
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 686,249 587,169
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 12,729 12,117
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 4,747 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 594,967 481,957
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 575,419 470,646
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 5,540 7,190
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 13,928 1,642
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 80 2,479
Excluding Purchased Impaired | Auto    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 306,187 282,474
Excluding Purchased Impaired | Auto | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 302,347 278,063
Excluding Purchased Impaired | Auto | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,612 4,131
Excluding Purchased Impaired | Auto | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,208 119
Excluding Purchased Impaired | Auto | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 20 161
Excluding Purchased Impaired | HELOC    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 605,937 536,571
Excluding Purchased Impaired | HELOC | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 596,925 531,358
Excluding Purchased Impaired | HELOC | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 5,177 3,867
Excluding Purchased Impaired | HELOC | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 3,835 857
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 575,259 647,789
Excluding Purchased Impaired | Consumer and all other | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 570,951 645,187
Excluding Purchased Impaired | Consumer and all other | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 3,486 1,758
Excluding Purchased Impaired | Consumer and all other | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 800 781
Excluding Purchased Impaired | Consumer and all other | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans $ 22 $ 63