Quarterly report pursuant to Section 13 or 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
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 9,124,900 $ 7,053,016
Total Loans 9,290,259 7,141,552
Construction and Land Development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,237,696 936,857
Total Loans 1,250,448 948,791
Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,256,120 925,910
Total Loans 1,293,791 943,933
Commercial Real Estate - Non-Owner Occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 2,290,797 1,703,592
Total Loans 2,318,589 1,713,659
Multifamily Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 541,560 356,999
Total Loans 541,730 357,079
Commercial & Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,086,945 609,829
Total Loans 1,093,771 612,023
Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 701,618 598,935
Total Loans 723,945 612,395
Residential 1-4 Family - Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 571,018 468,763
Total Loans 607,155 485,690
Auto    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 293,505 278,295
Total Loans 296,706 282,474
HELOC    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 613,660 531,180
Total Loans 626,916 537,521
Consumer and all other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 531,981 642,656
Total Loans 537,208 647,987
Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 86,007 35,418
Total Loans 101,524 39,021
Purchased Impaired | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 2,301 1,644
Purchased Impaired | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 13,216 1,959
Purchased Impaired | Construction and Land Development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 3,860 2,773
Total Loans 5,183 2,838
Purchased Impaired | Construction and Land Development | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 269 8
Purchased Impaired | Construction and Land Development | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 1,054 57
Purchased Impaired | Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 22,523 13,931
Total Loans 26,720 14,790
Purchased Impaired | Commercial Real Estate - Owner Occupied | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 171 381
Purchased Impaired | Commercial Real Estate - Owner Occupied | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 4,026 478
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 22,387 6,189
Total Loans 24,680 6,610
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 37 188
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 2,256 233
Purchased Impaired | Multifamily Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 84 80
Total Loans 84 80
Purchased Impaired | Multifamily Real Estate | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Purchased Impaired | Multifamily Real Estate | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Purchased Impaired | Commercial & Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,315 408
Total Loans 1,851 408
Purchased Impaired | Commercial & Industrial | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Purchased Impaired | Commercial & Industrial | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 536 0
Purchased Impaired | Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 14,890 8,630
Total Loans 17,227 9,414
Purchased Impaired | Residential 1-4 Family - Commercial | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 343 433
Purchased Impaired | Residential 1-4 Family - Commercial | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 1,994 351
Purchased Impaired | Residential 1-4 Family - Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 14,256 2,764
Total Loans 18,002 3,733
Purchased Impaired | Residential 1-4 Family - Mortgage | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 1,069 343
Purchased Impaired | Residential 1-4 Family - Mortgage | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 2,677 626
Purchased Impaired | Auto    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 11  
Total Loans 11 0
Purchased Impaired | Auto | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0  
Purchased Impaired | Auto | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0  
Purchased Impaired | HELOC    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 5,826 445
Total Loans 6,890 950
Purchased Impaired | HELOC | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 405 291
Purchased Impaired | HELOC | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 659 214
Purchased Impaired | Consumer and all other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 855 198
Total Loans 876 198
Purchased Impaired | Consumer and all other | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 7 0
Purchased Impaired | Consumer and all other | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due $ 14 $ 0