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, 2016
Dec. 31, 2015
Sep. 30, 2015
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 6,148,918 $ 5,671,462 $ 5,543,621
Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 776,430 749,720 694,645
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 857,142 860,086 863,578
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,454,828 1,270,480 1,223,607
Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 339,313 322,528 329,959
Commercial & Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 509,857 435,365 409,657
Residential 1-4 Family      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 999,361 978,469 987,788
Auto      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 255,188 234,061 225,994
HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 524,097 516,726 514,362
Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 432,702 304,027 $ 294,031
Excluding Purchased Impaired      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 6,086,572 5,597,725  
Excluding Purchased Impaired | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 5,853,357 5,372,500  
Excluding Purchased Impaired | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 182,826 161,222  
Excluding Purchased Impaired | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 47,030 58,872  
Excluding Purchased Impaired | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 3,359 5,131  
Excluding Purchased Impaired | Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 773,225 743,734  
Excluding Purchased Impaired | Construction and Land Development | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 690,623 663,067  
Excluding Purchased Impaired | Construction and Land Development | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 56,433 52,650  
Excluding Purchased Impaired | Construction and Land Development | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 25,559 27,980  
Excluding Purchased Impaired | Construction and Land Development | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 610 37  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 838,078 832,698  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 806,096 800,979  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 26,090 20,856  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 5,892 8,931  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 1,932  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,436,687 1,256,961  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,399,369 1,228,956  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 33,608 22,341  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 3,710 5,664  
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 337,234 320,973  
Excluding Purchased Impaired | Multifamily Real Estate | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 313,497 315,128  
Excluding Purchased Impaired | Multifamily Real Estate | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 23,737 2,017  
Excluding Purchased Impaired | Multifamily Real Estate | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 3,828  
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 508,712 433,552  
Excluding Purchased Impaired | Commercial & Industrial | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 495,764 414,333  
Excluding Purchased Impaired | Commercial & Industrial | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 10,088 16,724  
Excluding Purchased Impaired | Commercial & Industrial | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,860 2,396  
Excluding Purchased Impaired | Commercial & Industrial | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 99  
Excluding Purchased Impaired | Residential 1-4 Family      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 982,533 957,310  
Excluding Purchased Impaired | Residential 1-4 Family | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 950,707 912,839  
Excluding Purchased Impaired | Residential 1-4 Family | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 22,163 34,728  
Excluding Purchased Impaired | Residential 1-4 Family | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 7,571 8,037  
Excluding Purchased Impaired | Residential 1-4 Family | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,092 1,706  
Excluding Purchased Impaired | Auto      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 255,188 234,061  
Excluding Purchased Impaired | Auto | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 252,549 230,670  
Excluding Purchased Impaired | Auto | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,459 3,109  
Excluding Purchased Impaired | Auto | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 91 194  
Excluding Purchased Impaired | Auto | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 89 88  
Excluding Purchased Impaired | HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 522,599 514,935  
Excluding Purchased Impaired | HELOC | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 516,178 507,514  
Excluding Purchased Impaired | HELOC | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 4,745 4,801  
Excluding Purchased Impaired | HELOC | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,305 1,611  
Excluding Purchased Impaired | HELOC | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 371 1,009  
Excluding Purchased Impaired | Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 432,316 303,501  
Excluding Purchased Impaired | Consumer and all other | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 428,574 299,014  
Excluding Purchased Impaired | Consumer and all other | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 3,503 3,996  
Excluding Purchased Impaired | Consumer and all other | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 42 231  
Excluding Purchased Impaired | Consumer and all other | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 197 $ 260