Quarterly report pursuant to Section 13 or 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Excluding Purchased Impaired Loans) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Excluding Purchased Impaired Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 6,898,729 $ 6,307,060 $ 6,148,918
Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 841,738 751,131 776,430
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 903,523 857,805 857,142
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,748,039 1,564,295 1,454,828
Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 368,686 334,276 339,313
Commercial & Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 554,522 551,526 509,857
Residential 1-4 Family      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,083,112 1,029,547 999,361
Auto      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 276,572 262,071 255,188
HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 535,446 526,884 524,097
Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 587,091 429,525 $ 432,702
Excluding Purchased Impaired      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 6,847,688 6,247,768  
Excluding Purchased Impaired | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 6,633,913 6,017,055  
Excluding Purchased Impaired | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 175,640 198,078  
Excluding Purchased Impaired | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 34,278 28,617  
Excluding Purchased Impaired | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 3,857 4,018  
Excluding Purchased Impaired | Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 838,712 748,209  
Excluding Purchased Impaired | Construction and Land Development | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 768,206 667,018  
Excluding Purchased Impaired | Construction and Land Development | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 57,190 69,311  
Excluding Purchased Impaired | Construction and Land Development | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 13,201 11,857  
Excluding Purchased Impaired | Construction and Land Development | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 115 23  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 885,855 839,462  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 834,265 801,565  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 47,019 32,364  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 4,571 5,533  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,733,663 1,546,992  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,702,500 1,505,153  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 23,764 37,631  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 7,399 4,208  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Excluding Purchased Impaired | Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 368,609 332,210  
Excluding Purchased Impaired | Multifamily Real Estate | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 361,175 312,711  
Excluding Purchased Impaired | Multifamily Real Estate | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 7,434 19,499  
Excluding Purchased Impaired | Multifamily Real Estate | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Excluding Purchased Impaired | Multifamily Real Estate | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Excluding Purchased Impaired | Commercial & Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 553,897 550,452  
Excluding Purchased Impaired | Commercial & Industrial | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 534,594 539,999  
Excluding Purchased Impaired | Commercial & Industrial | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 16,400 9,391  
Excluding Purchased Impaired | Commercial & Industrial | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,903 1,062  
Excluding Purchased Impaired | Commercial & Industrial | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Excluding Purchased Impaired | Residential 1-4 Family      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,069,035 1,013,347  
Excluding Purchased Impaired | Residential 1-4 Family | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,045,736 986,973  
Excluding Purchased Impaired | Residential 1-4 Family | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 15,878 18,518  
Excluding Purchased Impaired | Residential 1-4 Family | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 4,480 4,813  
Excluding Purchased Impaired | Residential 1-4 Family | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,941 3,043  
Excluding Purchased Impaired | Auto      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 276,572 262,071  
Excluding Purchased Impaired | Auto | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 273,446 258,188  
Excluding Purchased Impaired | Auto | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,910 3,648  
Excluding Purchased Impaired | Auto | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 143 135  
Excluding Purchased Impaired | Auto | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 73 100  
Excluding Purchased Impaired | HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 534,464 525,723  
Excluding Purchased Impaired | HELOC | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 530,263 519,928  
Excluding Purchased Impaired | HELOC | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,427 4,225  
Excluding Purchased Impaired | HELOC | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,051 969  
Excluding Purchased Impaired | HELOC | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 723 601  
Excluding Purchased Impaired | Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 586,881 429,302  
Excluding Purchased Impaired | Consumer and all other | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 583,728 425,520  
Excluding Purchased Impaired | Consumer and all other | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,618 3,491  
Excluding Purchased Impaired | Consumer and all other | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 530 40  
Excluding Purchased Impaired | Consumer and all other | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 5 $ 251