Quarterly report pursuant to Section 13 or 15(d)

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

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Including Purchased Impaired Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 5,780,502 [1] $ 5,671,462 [1] $ 5,387,755
Construction and Land Development [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 776,698 749,720 657,581
Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 849,202 860,086 898,222
Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,296,251 1,270,480 1,180,464
Multifamily Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 323,270 322,528 298,651
Commercial & Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 453,208 435,365 409,867
Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 978,478 978,469 970,928
HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 517,122 516,726 514,750
Consumer and all Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 344,536 304,027 245,999
Purchased Impaired [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 70,105 73,737 91,346
Purchased Impaired [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 5,137 5,986 9,529
Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 27,260 27,388 31,004
Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 13,636 13,519 16,648
Purchased Impaired [Member] | Multifamily Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 2,132 1,555 3,021
Purchased Impaired [Member] | Commercial & Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,571 1,813 3,251
Purchased Impaired [Member] | Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 18,305 21,159 24,654
Purchased Impaired [Member] | HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,535 1,791 1,889
Purchased Impaired [Member] | Consumer and all Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 529 526 $ 1,350
Purchased Impaired [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 23,133 22,339  
Purchased Impaired [Member] | Pass [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,539 2,059  
Purchased Impaired [Member] | Pass [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 5,495 5,260  
Purchased Impaired [Member] | Pass [Member] | Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 5,943 4,442  
Purchased Impaired [Member] | Pass [Member] | Multifamily Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 357 356  
Purchased Impaired [Member] | Pass [Member] | Commercial & Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 127 144  
Purchased Impaired [Member] | Pass [Member] | Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 8,794 9,098  
Purchased Impaired [Member] | Pass [Member] | HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 826 923  
Purchased Impaired [Member] | Pass [Member] | Consumer and all Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 52 57  
Purchased Impaired [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 31,531 33,862  
Purchased Impaired [Member] | Special Mention [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,918 1,778  
Purchased Impaired [Member] | Special Mention [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 15,014 15,530  
Purchased Impaired [Member] | Special Mention [Member] | Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 6,457 7,827  
Purchased Impaired [Member] | Special Mention [Member] | Multifamily Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,775 1,199  
Purchased Impaired [Member] | Special Mention [Member] | Commercial & Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 326 359  
Purchased Impaired [Member] | Special Mention [Member] | Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 5,470 6,380  
Purchased Impaired [Member] | Special Mention [Member] | HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 163 410  
Purchased Impaired [Member] | Special Mention [Member] | Consumer and all Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 408 379  
Purchased Impaired [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 14,188 15,760  
Purchased Impaired [Member] | Substandard [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,441 1,908  
Purchased Impaired [Member] | Substandard [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 6,751 6,598  
Purchased Impaired [Member] | Substandard [Member] | Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,236 1,250  
Purchased Impaired [Member] | Substandard [Member] | Commercial & Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,098 1,289  
Purchased Impaired [Member] | Substandard [Member] | Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 3,593 4,605  
Purchased Impaired [Member] | Substandard [Member] | HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income   20  
Purchased Impaired [Member] | Substandard [Member] | Consumer and all Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 69 90  
Purchased Impaired [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,253 1,776  
Purchased Impaired [Member] | Doubtful [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 239 241  
Purchased Impaired [Member] | Doubtful [Member] | Commercial & Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 20 21  
Purchased Impaired [Member] | Doubtful [Member] | Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 448 1,076  
Purchased Impaired [Member] | Doubtful [Member] | HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 546 $ 438  
[1] Loans, as presented, are net of deferred fees and costs totaling $3.6 million and $3.0 million as of March 31, 2016 and December 31, 2015, respectively.