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
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 9,242,170 $ 7,053,016
Total Loans 9,411,598 7,141,552
Construction and Land Development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,160,172 936,857
Total Loans 1,178,054 948,791
Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,245,684 925,910
Total Loans 1,283,125 943,933
Commercial Real Estate - Non-Owner Occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 2,403,372 1,703,592
Total Loans 2,427,251 1,713,659
Multifamily Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 542,023 356,999
Total Loans 542,662 357,079
Commercial & Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,147,957 609,829
Total Loans 1,154,583 612,023
Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 696,964 598,935
Total Loans 719,798 612,395
Residential 1-4 Family - Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 575,590 468,763
Total Loans 611,728 485,690
Auto    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 302,738 278,295
Total Loans 306,196 282,474
HELOC    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 597,198 531,180
Total Loans 612,116 537,521
Consumer and all other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 570,472 642,656
Total Loans 576,085 647,987
Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 75,851 35,418
Total Loans 94,746 39,021
Purchased Impaired | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 5,843 1,644
Purchased Impaired | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 13,052 1,959
Purchased Impaired | Construction and Land Development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 3,640 2,773
Total Loans 5,042 2,838
Purchased Impaired | Construction and Land Development | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 78 8
Purchased Impaired | Construction and Land Development | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 1,324 57
Purchased Impaired | Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 21,974 13,931
Total Loans 25,896 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 435 381
Purchased Impaired | Commercial Real Estate - Owner Occupied | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 3,487 478
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 19,731 6,189
Total Loans 21,575 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 33 188
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 1,811 233
Purchased Impaired | Multifamily Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 86 80
Total Loans 86 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 1,165 408
Total Loans 2,299 408
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 1,134 0
Purchased Impaired | Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 10,385 8,630
Total Loans 16,073 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 3,677 433
Purchased Impaired | Residential 1-4 Family - Commercial | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 2,011 351
Purchased Impaired | Residential 1-4 Family - Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 12,693 2,764
Total Loans 16,761 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 1,242 343
Purchased Impaired | Residential 1-4 Family - Mortgage | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 2,826 626
Purchased Impaired | Auto    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 9  
Total Loans 9 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 5,395 445
Total Loans 6,179 950
Purchased Impaired | HELOC | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 337 291
Purchased Impaired | HELOC | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 447 214
Purchased Impaired | Consumer and all other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 773 198
Total Loans 826 198
Purchased Impaired | Consumer and all other | 30 To 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 41 0
Purchased Impaired | Consumer and all other | Greater than 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due $ 12 $ 0