Annual report pursuant to Section 13 and 15(d)

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

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Including 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
Purchased Impaired      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 39,021 59,292 73,737
Purchased Impaired | Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,838 2,922 5,986
Purchased Impaired | Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 14,790 18,343 27,388
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 6,610 17,303 13,519
Purchased Impaired | Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 80 2,066 1,555
Purchased Impaired | Commercial and Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 408 1,074 1,813
Purchased Impaired | Residential 1-4 Family - Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 9,414 12,222 16,119
Purchased Impaired | Residential 1-4 Family - Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 3,733 3,978 5,040
Purchased Impaired | Auto      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0 0
Purchased Impaired | HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 950 1,161 1,791
Purchased Impaired | Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 198 223 $ 526
Purchased Impaired | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 19,017 27,569  
Purchased Impaired | Pass | Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,462 1,092  
Purchased Impaired | Pass | Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 4,958 5,520  
Purchased Impaired | Pass | Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 3,920 10,927  
Purchased Impaired | Pass | Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 343  
Purchased Impaired | Pass | Commercial and Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 85 107  
Purchased Impaired | Pass | Residential 1-4 Family - Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 5,234 5,959  
Purchased Impaired | Pass | Residential 1-4 Family - Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,764 2,598  
Purchased Impaired | Pass | HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 446 857  
Purchased Impaired | Pass | Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 148 166  
Purchased Impaired | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 13,881 21,837  
Purchased Impaired | Special Mention | Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,260 1,432  
Purchased Impaired | Special Mention | Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 7,486 8,889  
Purchased Impaired | Special Mention | Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,394 4,638  
Purchased Impaired | Special Mention | Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 80 1,723  
Purchased Impaired | Special Mention | Commercial and Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 123 480  
Purchased Impaired | Special Mention | Residential 1-4 Family - Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,877 3,943  
Purchased Impaired | Special Mention | Residential 1-4 Family - Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 329 512  
Purchased Impaired | Special Mention | HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 291 183  
Purchased Impaired | Special Mention | Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 41 37  
Purchased Impaired | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 5,435 9,256  
Purchased Impaired | Substandard | Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 116 398  
Purchased Impaired | Substandard | Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,346 3,934  
Purchased Impaired | Substandard | Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,296 1,738  
Purchased Impaired | Substandard | Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Purchased Impaired | Substandard | Commercial and Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 200 487  
Purchased Impaired | Substandard | Residential 1-4 Family - Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,303 2,320  
Purchased Impaired | Substandard | Residential 1-4 Family - Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 71 352  
Purchased Impaired | Substandard | HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 94 7  
Purchased Impaired | Substandard | Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 9 20  
Purchased Impaired | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 688 630  
Purchased Impaired | Doubtful | Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Purchased Impaired | Doubtful | Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Purchased Impaired | Doubtful | Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Purchased Impaired | Doubtful | Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Purchased Impaired | Doubtful | Commercial and Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Purchased Impaired | Doubtful | Residential 1-4 Family - Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Purchased Impaired | Doubtful | Residential 1-4 Family - Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 569 516  
Purchased Impaired | Doubtful | HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 119 114  
Purchased Impaired | Doubtful | Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 0 $ 0