Annual report pursuant to Section 13 and 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (PCI Loan Portfolios by Segment and Delinquency Status) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (PCI Loan Portfolios by Segment and Delinquency Status) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current $ 7,053,016 $ 6,209,924  
Total Loans 7,141,552 6,307,060 $ 5,671,462
Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 35,418 55,244  
Total Loans 39,021 59,292 73,737
Construction and Land Development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 936,857 744,702  
Total Loans 948,791 751,131 749,720
Construction and Land Development | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,773 2,838  
Total Loans 2,838 2,922 5,986
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 925,910 836,682  
Total Loans 943,933 857,805 860,086
Commercial Real Estate - Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 13,931 17,553  
Total Loans 14,790 18,343 27,388
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,703,592 1,544,623  
Total Loans 1,713,659 1,564,295 1,270,480
Commercial Real Estate - Non-Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 6,189 16,768  
Total Loans 6,610 17,303 13,519
Multifamily Real Estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 356,999 332,063  
Total Loans 357,079 334,276 322,528
Multifamily Real Estate | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 80 2,066  
Total Loans 80 2,066 1,555
Commercial and Industrial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 609,829 548,702  
Total Loans 612,023 551,526 435,365
Commercial and Industrial | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 408 974  
Total Loans 408 1,074 1,813
Residential 1-4 Family - Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 598,935 535,874  
Total Loans 612,395 551,636 517,063
Residential 1-4 Family - Commercial | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 8,630 11,165  
Total Loans 9,414 12,222 16,119
Residential 1-4 Family - Mortgage      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 468,763 462,574  
Total Loans 485,690 477,911 461,406
Residential 1-4 Family - Mortgage | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,764 2,792  
Total Loans 3,733 3,978 5,040
HELOC      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 531,180 520,833  
Total Loans 537,521 526,884 516,726
HELOC | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 445 865  
Total Loans 950 1,161 1,791
Consumer and all other      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 642,656 424,967  
Total Loans 647,987 429,525 304,027
Consumer and all other | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 198 223  
Total Loans 198 223 $ 526
30 To 89 Days Past Due | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,644 2,197  
30 To 89 Days Past Due | Construction and Land Development | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 8 0  
30 To 89 Days Past Due | Commercial Real Estate - Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 381 271  
30 To 89 Days Past Due | Commercial Real Estate - Non-Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 188 409  
30 To 89 Days Past Due | Multifamily Real Estate | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 0  
30 To 89 Days Past Due | Commercial and Industrial | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 44  
30 To 89 Days Past Due | Residential 1-4 Family - Commercial | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 433 964  
30 To 89 Days Past Due | Residential 1-4 Family - Mortgage | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 343 334  
30 To 89 Days Past Due | HELOC | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 291 175  
30 To 89 Days Past Due | Consumer and all other | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 0  
Greater Than 90 Days and still Accruing | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,959 1,851  
Greater Than 90 Days and still Accruing | Construction and Land Development | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 57 84  
Greater Than 90 Days and still Accruing | Commercial Real Estate - Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 478 519  
Greater Than 90 Days and still Accruing | Commercial Real Estate - Non-Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 233 126  
Greater Than 90 Days and still Accruing | Multifamily Real Estate | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 0  
Greater Than 90 Days and still Accruing | Commercial and Industrial | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 56  
Greater Than 90 Days and still Accruing | Residential 1-4 Family - Commercial | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 351 93  
Greater Than 90 Days and still Accruing | Residential 1-4 Family - Mortgage | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 626 852  
Greater Than 90 Days and still Accruing | HELOC | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 214 121  
Greater Than 90 Days and still Accruing | Consumer and all other | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due $ 0 $ 0