Annual report pursuant to Section 13 and 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
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Total Loans $ 9,716,207 $ 7,141,552
Construction and Land Development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,194,821 948,791
Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,337,345 943,933
Commercial Real Estate - Non-Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,467,410 1,713,659
Multifamily Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 548,231 357,079
Commercial and Industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,317,135 612,023
Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 713,750 612,395
Residential 1-4 Family - Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 600,578 485,690
Auto    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 301,943 282,474
HELOC    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 613,383 537,521
Consumer and all other    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 621,611 647,987
Excluding Purchased Impaired    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 9,625,986 7,102,531
Excluding Purchased Impaired | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 9,344,002 6,880,526
Excluding Purchased Impaired | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 201,174 184,654
Excluding Purchased Impaired | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 80,810 34,114
Excluding Purchased Impaired | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 3,237
Excluding Purchased Impaired | Construction and Land Development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,186,167 945,953
Excluding Purchased Impaired | Construction and Land Development | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,130,577 869,111
Excluding Purchased Impaired | Construction and Land Development | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 43,894 62,517
Excluding Purchased Impaired | Construction and Land Development | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 11,696 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 1,311,701 929,143
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,231,422 872,130
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 50,939 52,268
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 29,340 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 2,450,075 1,707,049
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,425,500 1,681,314
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 17,648 19,899
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 6,927 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 548,143 356,999
Excluding Purchased Impaired | Multifamily Real Estate | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 537,572 349,625
Excluding Purchased Impaired | Multifamily Real Estate | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 10,571 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 and Industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,314,979 611,615
Excluding Purchased Impaired | Commercial and Industrial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,273,549 595,923
Excluding Purchased Impaired | Commercial and Industrial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 34,864 13,533
Excluding Purchased Impaired | Commercial and Industrial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 6,566 2,159
Excluding Purchased Impaired | Commercial and 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 700,043 602,981
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 677,109 587,169
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 17,086 12,117
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 5,848 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 583,812 481,957
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 554,192 470,646
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 14,855 7,190
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 14,765 1,642
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 2,479
Excluding Purchased Impaired | Auto    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 301,936 282,474
Excluding Purchased Impaired | Auto | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 296,907 278,063
Excluding Purchased Impaired | Auto | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 3,590 4,131
Excluding Purchased Impaired | Auto | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,439 119
Excluding Purchased Impaired | Auto | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 161
Excluding Purchased Impaired | HELOC    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 608,268 536,571
Excluding Purchased Impaired | HELOC | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 598,444 531,358
Excluding Purchased Impaired | HELOC | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 6,316 3,867
Excluding Purchased Impaired | HELOC | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 3,508 857
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 620,862 647,789
Excluding Purchased Impaired | Consumer and all other | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 618,730 645,187
Excluding Purchased Impaired | Consumer and all other | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,411 1,758
Excluding Purchased Impaired | Consumer and all other | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 721 781
Excluding Purchased Impaired | Consumer and all other | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans $ 0 $ 63