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, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 7,141,552 $ 6,307,060 $ 5,671,462
Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 948,791 751,131 749,720
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 943,933 857,805 860,086
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,713,659 1,564,295 1,270,480
Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 357,079 334,276 322,528
Commercial and Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 612,023 551,526 435,365
Residential 1-4 Family - Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 612,395 551,636 517,063
Residential 1-4 Family - Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 485,690 477,911 461,406
Auto      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 282,474 262,071 234,061
HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 537,521 526,884 516,726
Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 647,987 429,525 $ 304,027
Excluding Purchased Impaired      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 7,102,531 6,247,768  
Excluding Purchased Impaired | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 6,880,526 6,017,055  
Excluding Purchased Impaired | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 184,654 198,078  
Excluding Purchased Impaired | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 34,114 28,617  
Excluding Purchased Impaired | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 3,237 4,018  
Excluding Purchased Impaired | Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 945,953 748,209  
Excluding Purchased Impaired | Construction and Land Development | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 869,111 667,018  
Excluding Purchased Impaired | Construction and Land Development | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 62,517 69,311  
Excluding Purchased Impaired | Construction and Land Development | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 14,325 11,857  
Excluding Purchased Impaired | Construction and Land Development | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 23  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 929,143 839,462  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 872,130 801,565  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 52,268 32,364  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 4,745 5,533  
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 1,707,049 1,546,992  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,681,314 1,505,153  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 19,899 37,631  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 5,836 4,208  
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 356,999 332,210  
Excluding Purchased Impaired | Multifamily Real Estate | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 349,625 312,711  
Excluding Purchased Impaired | Multifamily Real Estate | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 7,374 19,499  
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 611,615 550,452  
Excluding Purchased Impaired | Commercial and Industrial | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 595,923 539,999  
Excluding Purchased Impaired | Commercial and Industrial | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 13,533 9,391  
Excluding Purchased Impaired | Commercial and Industrial | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,159 1,062  
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 602,981 539,414  
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 587,169 523,964  
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 12,117 11,715  
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 3,650 3,534  
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 45 201  
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 481,957 473,933  
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 470,646 463,009  
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 7,190 6,803  
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,642 1,279  
Excluding Purchased Impaired | Residential 1-4 Family - Mortgage | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,479 2,842  
Excluding Purchased Impaired | Auto      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 282,474 262,071  
Excluding Purchased Impaired | Auto | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 278,063 258,188  
Excluding Purchased Impaired | Auto | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 4,131 3,648  
Excluding Purchased Impaired | Auto | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 119 135  
Excluding Purchased Impaired | Auto | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 161 100  
Excluding Purchased Impaired | HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 536,571 525,723  
Excluding Purchased Impaired | HELOC | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 531,358 519,928  
Excluding Purchased Impaired | HELOC | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 3,867 4,225  
Excluding Purchased Impaired | HELOC | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 857 969  
Excluding Purchased Impaired | HELOC | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 489 601  
Excluding Purchased Impaired | Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 647,789 429,302  
Excluding Purchased Impaired | Consumer and all other | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 645,187 425,520  
Excluding Purchased Impaired | Consumer and all other | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,758 3,491  
Excluding Purchased Impaired | Consumer and all other | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 781 40  
Excluding Purchased Impaired | Consumer and all other | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 63 $ 251