Quarterly report pursuant to Section 13 or 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Summary of Aging of the Loan Portfolio by Segment) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Summary of Aging of the Loan Portfolio by Segment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater than 90 Days and still Accruing $ 2,630 $ 3,532  
Total Loans 9,805,723 7,141,552 $ 6,554,046
Nonaccrual 25,138 21,743  
Current 9,636,112 7,053,016  
Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 102,861 39,021 57,770
Current 85,028 35,418  
30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 29,690 16,873  
60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 9,292 7,367  
Construction and Land Development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater than 90 Days and still Accruing 322 1,340  
Total Loans 1,249,196 948,791 770,287
Nonaccrual 6,391 5,610  
Current 1,230,587 936,857  
Construction and Land Development | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 10,202 2,838 2,776
Current 8,239 2,773  
Construction and Land Development | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 403 1,248  
Construction and Land Development | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,291 898  
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater than 90 Days and still Accruing 0 0  
Total Loans 1,279,155 943,933 870,559
Nonaccrual 2,539 2,708  
Current 1,245,028 925,910  
Commercial Real Estate - Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 25,826 14,790 18,199
Current 20,393 13,931  
Commercial Real Estate - Owner Occupied | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 4,985 444  
Commercial Real Estate - Owner Occupied | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 777 81  
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater than 90 Days and still Accruing 0 194  
Total Loans 2,230,463 1,713,659 1,631,767
Nonaccrual 2,089 2,992  
Current 2,206,913 1,703,592  
Commercial Real Estate - Non-Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 19,594 6,610 16,725
Current 17,856 6,189  
Commercial Real Estate - Non-Owner Occupied | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,867 187  
Commercial Real Estate - Non-Owner Occupied | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 84  
Multifamily Real Estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater than 90 Days and still Accruing 0 0  
Total Loans 547,520 357,079 353,769
Nonaccrual 0 0  
Current 544,140 356,999  
Multifamily Real Estate | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 3,380 80 2,058
Current 3,380 80  
Multifamily Real Estate | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 0  
Multifamily Real Estate | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 0  
Commercial & Industrial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater than 90 Days and still Accruing 200 214  
Total Loans 1,125,733 612,023 576,567
Nonaccrual 1,969 316  
Current 1,116,812 609,829  
Commercial & Industrial | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 2,890 408 733
Current 2,732 408  
Commercial & Industrial | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 2,608 1,147  
Commercial & Industrial | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,254 109  
Residential 1-4 Family - Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater than 90 Days and still Accruing 113 579  
Total Loans 714,660 612,395 580,568
Nonaccrual 1,512 1,085  
Current 693,542 598,935  
Residential 1-4 Family - Commercial | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 14,826 9,414 11,946
Current 12,989 8,630  
Residential 1-4 Family - Commercial | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 3,707 1,682  
Residential 1-4 Family - Commercial | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 960 700  
Residential 1-4 Family - Mortgage      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater than 90 Days and still Accruing 1,148 546  
Total Loans 604,354 485,690 476,871
Nonaccrual 7,929 6,269  
Current 567,153 468,763  
Residential 1-4 Family - Mortgage | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 20,517 3,733 3,964
Current 14,768 2,764  
Residential 1-4 Family - Mortgage | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 6,210 3,838  
Residential 1-4 Family - Mortgage | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,397 2,541  
Auto      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater than 90 Days and still Accruing 170 40  
Total Loans 288,089 282,474 271,466
Nonaccrual 394 413  
Current 285,151 278,295  
Auto | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 14 0 0
Current 14    
Auto | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 2,167 3,541  
Auto | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 193 185  
HELOC      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater than 90 Days and still Accruing 306 217  
Total Loans 642,084 537,521 527,863
Nonaccrual 2,072 2,075  
Current 632,912 531,180  
HELOC | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 1,884 950 1,156
Current 1,156 445  
HELOC | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 3,564 2,382  
HELOC | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,346 717  
Consumer and all other      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater than 90 Days and still Accruing 371 402  
Total Loans 1,124,469 647,987 494,329
Nonaccrual 243 275  
Current 1,113,874 642,656  
Consumer and all other | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 3,728 198 $ 213
Current 3,501 198  
Consumer and all other | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 4,179 2,404  
Consumer and all other | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due $ 2,074 $ 2,052