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
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 9,805,723 $ 7,141,552 $ 6,554,046
Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,249,196 948,791 770,287
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,279,155 943,933 870,559
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,230,463 1,713,659 1,631,767
Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 547,520 357,079 353,769
Commercial & Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,125,733 612,023 576,567
Residential 1-4 Family - Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 714,660 612,395 580,568
Residential 1-4 Family - Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 604,354 485,690 476,871
Auto      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 288,089 282,474 271,466
HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 642,084 537,521 527,863
Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,124,469 647,987 $ 494,329
Excluding Purchased Impaired      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 9,702,862 7,102,531  
Excluding Purchased Impaired | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 9,391,547 6,880,526  
Excluding Purchased Impaired | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 257,773 184,654  
Excluding Purchased Impaired | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 53,523 34,114  
Excluding Purchased Impaired | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 19 3,237  
Excluding Purchased Impaired | Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,238,994 945,953  
Excluding Purchased Impaired | Construction and Land Development | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,160,775 869,111  
Excluding Purchased Impaired | Construction and Land Development | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 67,489 62,517  
Excluding Purchased Impaired | Construction and Land Development | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 10,730 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 1,253,329 929,143  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,180,445 872,130  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 57,927 52,268  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 14,957 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 2,210,869 1,707,049  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,178,842 1,681,314  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 24,579 19,899  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 7,448 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 544,140 356,999  
Excluding Purchased Impaired | Multifamily Real Estate | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 532,643 349,625  
Excluding Purchased Impaired | Multifamily Real Estate | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 11,497 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 1,122,843 611,615  
Excluding Purchased Impaired | Commercial & Industrial | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,076,460 595,923  
Excluding Purchased Impaired | Commercial & Industrial | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 42,852 13,533  
Excluding Purchased Impaired | Commercial & Industrial | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 3,531 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 699,834 602,981  
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 677,693 587,169  
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 17,688 12,117  
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 4,453 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 583,837 481,957  
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 563,869 470,646  
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 11,893 7,190  
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 8,075 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 288,075 282,474  
Excluding Purchased Impaired | Auto | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 284,933 278,063  
Excluding Purchased Impaired | Auto | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,552 4,131  
Excluding Purchased Impaired | Auto | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 579 119  
Excluding Purchased Impaired | Auto | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 11 161  
Excluding Purchased Impaired | HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 640,200 536,571  
Excluding Purchased Impaired | HELOC | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 620,155 531,358  
Excluding Purchased Impaired | HELOC | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 16,992 3,867  
Excluding Purchased Impaired | HELOC | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 3,053 857  
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 1,120,741 647,789  
Excluding Purchased Impaired | Consumer and all other | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,115,732 645,187  
Excluding Purchased Impaired | Consumer and all other | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 4,304 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 $ 8 $ 63