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
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current $ 9,636,112 $ 7,053,016  
Total Loans 9,805,723 7,141,552 $ 6,554,046
Construction and Land Development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,230,587 936,857  
Total Loans 1,249,196 948,791 770,287
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,245,028 925,910  
Total Loans 1,279,155 943,933 870,559
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,206,913 1,703,592  
Total Loans 2,230,463 1,713,659 1,631,767
Multifamily Real Estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 544,140 356,999  
Total Loans 547,520 357,079 353,769
Commercial & Industrial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,116,812 609,829  
Total Loans 1,125,733 612,023 576,567
Residential 1-4 Family - Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 693,542 598,935  
Total Loans 714,660 612,395 580,568
Residential 1-4 Family - Mortgage      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 567,153 468,763  
Total Loans 604,354 485,690 476,871
Auto      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 285,151 278,295  
Total Loans 288,089 282,474 271,466
HELOC      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 632,912 531,180  
Total Loans 642,084 537,521 527,863
Consumer and all other      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,113,874 642,656  
Total Loans 1,124,469 647,987 494,329
Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 85,028 35,418  
Total Loans 102,861 39,021 57,770
Purchased Impaired | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 2,856 1,644  
Purchased Impaired | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 14,977 1,959  
Purchased Impaired | Construction and Land Development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 8,239 2,773  
Total Loans 10,202 2,838 2,776
Purchased Impaired | Construction and Land Development | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 54 8  
Purchased Impaired | Construction and Land Development | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,909 57  
Purchased Impaired | Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 20,393 13,931  
Total Loans 25,826 14,790 18,199
Purchased Impaired | Commercial Real Estate - Owner Occupied | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 438 381  
Purchased Impaired | Commercial Real Estate - Owner Occupied | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 4,995 478  
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 17,856 6,189  
Total Loans 19,594 6,610 16,725
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 180 188  
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,558 233  
Purchased Impaired | Multifamily Real Estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 3,380 80  
Total Loans 3,380 80 2,058
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 2,732 408  
Total Loans 2,890 408 733
Purchased Impaired | Commercial & Industrial | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 38 0  
Purchased Impaired | Commercial & Industrial | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 120 0  
Purchased Impaired | Residential 1-4 Family - Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 12,989 8,630  
Total Loans 14,826 9,414 11,946
Purchased Impaired | Residential 1-4 Family - Commercial | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 383 433  
Purchased Impaired | Residential 1-4 Family - Commercial | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,454 351  
Purchased Impaired | Residential 1-4 Family - Mortgage      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 14,768 2,764  
Total Loans 20,517 3,733 3,964
Purchased Impaired | Residential 1-4 Family - Mortgage | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,673 343  
Purchased Impaired | Residential 1-4 Family - Mortgage | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 4,076 626  
Purchased Impaired | Auto      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 14    
Total Loans 14 0 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 1,156 445  
Total Loans 1,884 950 1,156
Purchased Impaired | HELOC | 30 To 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 83 291  
Purchased Impaired | HELOC | Greater than 90 Days      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 645 214  
Purchased Impaired | Consumer and all other      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 3,501 198  
Total Loans 3,728 198 $ 213
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 $ 220 $ 0