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
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable Recorded Investment [Line Items]    
Loans $ 2,590,192 $ 2,363,182
Commercial Financial and Agricultural Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 1,150,977 1,030,990
Commercial Real Estate Construction Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 162,076 158,361
Commercial Mortgage Loans Owner Occupied [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 623,146 568,041
One To Four Family Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 252,357 235,909
Other Real Estate Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 359,923 323,599
Residential Real Estate Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 1,235,426 1,127,549
Consumer Portfolio Segment [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 41,713 46,282
Performing Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 2,575,168 2,352,824
Performing Financing Receivable [Member] | Commercial Financial and Agricultural Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 1,149,580 1,030,714
Performing Financing Receivable [Member] | Commercial Real Estate Construction Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 149,853 151,901
Performing Financing Receivable [Member] | Commercial Mortgage Loans Owner Occupied [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 622,391 565,255
Performing Financing Receivable [Member] | One To Four Family Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 252,060 235,456
Performing Financing Receivable [Member] | Other Real Estate Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 359,686 323,359
Performing Financing Receivable [Member] | Residential Real Estate Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 1,234,137 1,124,070
Performing Financing Receivable [Member] | Consumer Portfolio Segment [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 41,598 46,139
Nonperforming Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 15,024 10,358
Nonperforming Financing Receivable [Member] | Commercial Financial and Agricultural Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 1,397 276
Nonperforming Financing Receivable [Member] | Commercial Real Estate Construction Financing Receivable [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 12,223 6,460
Nonperforming Financing Receivable [Member] | Commercial Mortgage Loans Owner Occupied [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 755 2,786
Nonperforming Financing Receivable [Member] | One To Four Family Mortgage Loans [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans 297 453
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 1,289 3,479
Nonperforming Financing Receivable [Member] | Consumer Portfolio Segment [Member]
   
Financing Receivable Recorded Investment [Line Items]    
Loans $ 115 $ 143