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
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
Auto [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 241,737 234,061 211,293
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
Excluding Purchased Impaired [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 5,710,397 5,597,725  
Excluding Purchased Impaired [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 5,501,023 5,372,500  
Excluding Purchased Impaired [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 146,786 161,222  
Excluding Purchased Impaired [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 56,643 58,872  
Excluding Purchased Impaired [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 5,945 5,131  
Excluding Purchased Impaired [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 771,561 743,734  
Excluding Purchased Impaired [Member] | Construction and Land Development [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 698,360 663,067  
Excluding Purchased Impaired [Member] | Construction and Land Development [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 43,994 52,650  
Excluding Purchased Impaired [Member] | Construction and Land Development [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 29,207 27,980  
Excluding Purchased Impaired [Member] | Construction and Land Development [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income   37  
Excluding Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 821,942 832,698  
Excluding Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 791,197 800,979  
Excluding Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 22,297 20,856  
Excluding Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 6,685 8,931  
Excluding Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,763 1,932  
Excluding Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,282,615 1,256,961  
Excluding Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,253,617 1,228,956  
Excluding Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 24,794 22,341  
Excluding Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 4,204 5,664  
Excluding Purchased Impaired [Member] | Multifamily Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 321,138 320,973  
Excluding Purchased Impaired [Member] | Multifamily Real Estate [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 315,361 315,128  
Excluding Purchased Impaired [Member] | Multifamily Real Estate [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,975 2,017  
Excluding Purchased Impaired [Member] | Multifamily Real Estate [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 3,802 3,828  
Excluding Purchased Impaired [Member] | Commercial & Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 451,637 433,552  
Excluding Purchased Impaired [Member] | Commercial & Industrial [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 434,139 414,333  
Excluding Purchased Impaired [Member] | Commercial & Industrial [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 14,668 16,724  
Excluding Purchased Impaired [Member] | Commercial & Industrial [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 2,740 2,396  
Excluding Purchased Impaired [Member] | Commercial & Industrial [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 90 99  
Excluding Purchased Impaired [Member] | Residential 1-4 Family [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 960,173 957,310  
Excluding Purchased Impaired [Member] | Residential 1-4 Family [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 918,919 912,839  
Excluding Purchased Impaired [Member] | Residential 1-4 Family [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 30,514 34,728  
Excluding Purchased Impaired [Member] | Residential 1-4 Family [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 8,170 8,037  
Excluding Purchased Impaired [Member] | Residential 1-4 Family [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 2,570 1,706  
Excluding Purchased Impaired [Member] | Auto [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 241,737 234,061  
Excluding Purchased Impaired [Member] | Auto [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 239,838 230,670  
Excluding Purchased Impaired [Member] | Auto [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,688 3,109  
Excluding Purchased Impaired [Member] | Auto [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 77 194  
Excluding Purchased Impaired [Member] | Auto [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 134 88  
Excluding Purchased Impaired [Member] | HELOC [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 515,587 514,935  
Excluding Purchased Impaired [Member] | HELOC [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 509,833 507,514  
Excluding Purchased Impaired [Member] | HELOC [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 3,283 4,801  
Excluding Purchased Impaired [Member] | HELOC [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 1,535 1,611  
Excluding Purchased Impaired [Member] | HELOC [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 936 1,009  
Excluding Purchased Impaired [Member] | Consumer and all Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 344,007 303,501  
Excluding Purchased Impaired [Member] | Consumer and all Other [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 339,759 299,014  
Excluding Purchased Impaired [Member] | Consumer and all Other [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 3,573 3,996  
Excluding Purchased Impaired [Member] | Consumer and all Other [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 223 231  
Excluding Purchased Impaired [Member] | Consumer and all Other [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 452 $ 260  
[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.