Quarterly report pursuant to Section 13 or 15(d)

LOANS (Loans By Performance Status) (Detail)

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LOANS (Loans By Performance Status) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Financing Receivable Recorded Investment [Line Items]    
Loans $ 2,731,973 $ 2,363,182
Commercial, financial and agricultural Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 1,222,953 1,030,990
Commercial Real Estate Construction Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 156,595 158,361
Commercial Mortgage Loans Owner Occupied [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 667,401 568,041
One To Four Family Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 262,144 235,909
Other Real Estate Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 379,490 323,599
Residential Real Estate Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 1,309,035 1,127,549
Consumer Portfolio Segment [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 43,390 46,282
Performing Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 2,722,577 2,352,824
Performing Financing Receivable [Member] | Commercial, financial and agricultural Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 1,222,110 1,030,714
Performing Financing Receivable [Member] | Commercial Real Estate Construction Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 152,037 151,901
Performing Financing Receivable [Member] | Commercial Mortgage Loans Owner Occupied [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 663,709 565,255
Performing Financing Receivable [Member] | One To Four Family Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 262,144 235,456
Performing Financing Receivable [Member] | Other Real Estate Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 379,253 323,359
Performing Financing Receivable [Member] | Residential Real Estate Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 1,305,106 1,124,070
Performing Financing Receivable [Member] | Consumer Portfolio Segment [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 43,324 46,139
Nonperforming Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 9,396 10,358
Nonperforming Financing Receivable [Member] | Commercial, financial and agricultural Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 843 276
Nonperforming Financing Receivable [Member] | Commercial Real Estate Construction Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 4,558 6,460
Nonperforming Financing Receivable [Member] | Commercial Mortgage Loans Owner Occupied [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 3,692 2,786
Nonperforming Financing Receivable [Member] | One To Four Family Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 0 453
Nonperforming Financing Receivable [Member] | Other Real Estate Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 237 240
Nonperforming Financing Receivable [Member] | Residential Real Estate Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 3,929 3,479
Nonperforming Financing Receivable [Member] | Consumer Portfolio Segment [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans $ 66 $ 143