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
Mar. 31, 2013
Dec. 31, 2012
Statement [Line Items]    
Loans $ 2,462,154 $ 2,363,182
Commercial Financial and Agricultural Financing Receivable [Member]
   
Statement [Line Items]    
Loans 1,090,877 1,030,990
Commercial Real Estate Construction Financing Receivable [Member]
   
Statement [Line Items]    
Loans 162,190 158,361
Commercial Mortgage Loans Owner Occupied [Member]
   
Statement [Line Items]    
Loans 583,956 568,041
One To Four Family Mortgage Loans [Member]
   
Statement [Line Items]    
Loans 244,242 235,909
Other Real Estate Mortgage Loans [Member]
   
Statement [Line Items]    
Loans 340,631 323,599
Residential Real Estate Mortgage Loans [Member]
   
Statement [Line Items]    
Loans 1,168,829 1,127,549
Consumer Portfolio Segment [Member]
   
Statement [Line Items]    
Loans 40,258 46,282
Performing Financing Receivable [Member]
   
Statement [Line Items]    
Loans 2,437,890 2,352,824
Performing Financing Receivable [Member] | Commercial Financial and Agricultural Financing Receivable [Member]
   
Statement [Line Items]    
Loans 1,089,529 1,030,714
Performing Financing Receivable [Member] | Commercial Real Estate Construction Financing Receivable [Member]
   
Statement [Line Items]    
Loans 146,722 151,901
Performing Financing Receivable [Member] | Commercial Mortgage Loans Owner Occupied [Member]
   
Statement [Line Items]    
Loans 580,170 565,255
Performing Financing Receivable [Member] | One To Four Family Mortgage Loans [Member]
   
Statement [Line Items]    
Loans 243,571 235,456
Performing Financing Receivable [Member] | Other Real Estate Mortgage Loans [Member]
   
Statement [Line Items]    
Loans 337,808 323,359
Performing Financing Receivable [Member] | Residential Real Estate Mortgage Loans [Member]
   
Statement [Line Items]    
Loans 1,161,549 1,124,070
Performing Financing Receivable [Member] | Consumer Portfolio Segment [Member]
   
Statement [Line Items]    
Loans 40,090 46,139
Nonperforming Financing Receivable [Member]
   
Statement [Line Items]    
Loans 24,264 10,358
Nonperforming Financing Receivable [Member] | Commercial Financial and Agricultural Financing Receivable [Member]
   
Statement [Line Items]    
Loans 1,348 276
Nonperforming Financing Receivable [Member] | Commercial Real Estate Construction Financing Receivable [Member]
   
Statement [Line Items]    
Loans 18,053 6,460
Nonperforming Financing Receivable [Member] | Commercial Mortgage Loans Owner Occupied [Member]
   
Statement [Line Items]    
Loans 3,786 2,786
Nonperforming Financing Receivable [Member] | One To Four Family Mortgage Loans [Member]
   
Statement [Line Items]    
Loans 671 453
Nonperforming Financing Receivable [Member] | Other Real Estate Mortgage Loans [Member]
   
Statement [Line Items]    
Loans 238 240
Nonperforming Financing Receivable [Member] | Residential Real Estate Mortgage Loans [Member]
   
Statement [Line Items]    
Loans 4,695 3,479
Nonperforming Financing Receivable [Member] | Consumer Portfolio Segment [Member]
   
Statement [Line Items]    
Loans $ 168 $ 143