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, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 9,537,156 $ 7,053,016
Total Loans 9,716,207 7,141,552
Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 71,213 35,418
Total Loans 90,221 39,021
Construction and Land Development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,177,204 936,857
Total Loans 1,194,821 948,791
Construction and Land Development | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 7,122 2,773
Total Loans 8,654 2,838
Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,294,975 925,910
Total Loans 1,337,345 943,933
Commercial Real Estate - Owner Occupied | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 20,705 13,931
Total Loans 25,644 14,790
Commercial Real Estate - Non-Owner Occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 2,447,907 1,703,592
Total Loans 2,467,410 1,713,659
Commercial Real Estate - Non-Owner Occupied | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 15,464 6,189
Total Loans 17,335 6,610
Multifamily Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 547,997 356,999
Total Loans 548,231 357,079
Multifamily Real Estate | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 88 80
Total Loans 88 80
Commercial and Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,309,581 609,829
Total Loans 1,317,135 612,023
Commercial and Industrial | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,017 408
Total Loans 2,156 408
Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 687,957 598,935
Total Loans 713,750 612,395
Residential 1-4 Family - Commercial | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 9,312 8,630
Total Loans 13,707 9,414
Residential 1-4 Family - Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 556,907 468,763
Total Loans 600,578 485,690
Residential 1-4 Family - Mortgage | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 12,455 2,764
Total Loans 16,766 3,733
Auto    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 297,442 278,295
Total Loans 301,943 282,474
Auto | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 7  
Total Loans 7 0
HELOC    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 600,055 531,180
Total Loans 613,383 537,521
HELOC | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 4,365 445
Total Loans 5,115 950
Consumer and all other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 617,131 642,656
Total Loans 621,611 647,987
Consumer and all other | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 678 198
Total Loans 749 198
30 To 89 Days Past Due | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 4,264 1,644
30 To 89 Days Past Due | Construction and Land Development | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 108 8
30 To 89 Days Past Due | Commercial Real Estate - Owner Occupied | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 658 381
30 To 89 Days Past Due | Commercial Real Estate - Non-Owner Occupied | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 61 188
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 47 0
30 To 89 Days Past Due | Residential 1-4 Family - Commercial | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 931 433
30 To 89 Days Past Due | Residential 1-4 Family - Mortgage | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 1,899 343
30 To 89 Days Past Due | Auto | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0  
30 To 89 Days Past Due | HELOC | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 498 291
30 To 89 Days Past Due | Consumer and all other | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 62 0
Greater Than 90 Days and still Accruing | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 14,744 1,959
Greater Than 90 Days and still Accruing | Construction and Land Development | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 1,424 57
Greater Than 90 Days and still Accruing | Commercial Real Estate - Owner Occupied | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 4,281 478
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 1,810 233
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 1,092 0
Greater Than 90 Days and still Accruing | Residential 1-4 Family - Commercial | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 3,464 351
Greater Than 90 Days and still Accruing | Residential 1-4 Family - Mortgage | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 2,412 626
Greater Than 90 Days and still Accruing | Auto | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0  
Greater Than 90 Days and still Accruing | HELOC | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 252 214
Greater Than 90 Days and still Accruing | Consumer and all other | Purchased Impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due $ 9 $ 0