Quarterly report pursuant to Section 13 or 15(d)

Details Of Loans (Detail)

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Details Of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans $ 2,161,130   $ 1,830,742      
Less: Allowance for loan losses (24,604) (23,239) (22,030) (21,466) (19,516) (18,077)
Percentage of loan portfolio 10000.00%   10000.00%      
Net Loans 2,136,526   1,808,712      
Commercial Financial And Agricultural Financing Receivable [Member]
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 910,220   799,464      
Less: Allowance for loan losses (7,276) (6,511) (6,627) (6,261) (5,822) (5,348)
Percentage of loan portfolio 4212.00%   4367.00%      
Commercial Real Estate Construction Financing Receivable [Member]
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 153,351   151,218      
Less: Allowance for loan losses (6,053) (7,582) (6,542) (6,279) (6,468) (6,373)
Percentage of loan portfolio 710.00%   826.00%      
Commercial Mortgage Loans Owner Occupied [Member]
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 530,350   398,601      
Percentage of loan portfolio 2454.00%   2177.00%      
One To Four Family Mortgage Loans [Member]
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 236,060   205,182      
Percentage of loan portfolio 1092.00%   1121.00%      
Other Real Estate Mortgage Loans [Member]
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 288,677   235,251      
Percentage of loan portfolio 1336.00%   1285.00%      
Residential Real Estate Mortgage Loans [Member]
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 1,055,087   839,034      
Less: Allowance for loan losses (4,807) (3,640) (3,295) (4,064) (3,187) (2,443)
Percentage of loan portfolio 4882.00%   4583.00%      
Consumer Portfolio Segment [Member]
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 42,472   41,026      
Less: Allowance for loan losses $ (303) $ (285) $ (531) $ (1,023) $ (551) $ (749)
Percentage of loan portfolio 196.00%   224.00%