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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary Of Significant Accounting Policies [Line Items]        
Cash balance in lieu of charges for check clearing and other services $ 250,000      
Equity investments 1,630,000 574,000    
Goodwill 104,866,000 83,056,000 84,914,000 84,648,000
Intangibles asset 3,522,000 4,326,000    
Accumulated amortization of intangibles 8,590,000 7,410,000    
Intangible assets, amortization expense for 2013 728,000      
Intangible assets, amortization expense for 2014 706,000      
Intangible assets, amortization expense for 2015 706,000      
Intangible assets, amortization expense for 2016 600,000      
Intangible assets, amortization expense for 2017 327,000      
Goodwill acquisitions 21,810,000 (619,000) 1,305,000  
Discount rate used in goodwill impairment testing 70.00%      
Impairment of goodwill   1,239,000 1,039,000  
Percentage of death benefits company shares 80.00%      
Percentage of interest in life proceeds of owner retained 20.00%      
Percentage of interest in cash surrender value of policies owner retained 100.00%      
Split dollar agreements 873,000 873,000    
Expenses on split dollar agreements 77,000   72,000  
Income on split dollar agreements   316,000    
Number of days past due to discontinue accrual of interest income of loan 90      
Net deferred loan fees 2,360,000 1,690,000    
Each share convertible into shares 69      
Minimum time for conversion 5 years      
Date for redeem shares at face value May 20, 2014      
Carrying value of VIE's 3,040,000 1,700,000    
VIE's maximum possible loss exposure 3,040,000 1,700,000    
Peoples
        
Summary Of Significant Accounting Policies [Line Items]        
Goodwill acquisitions 10,210,000      
Waccamaw Bank
        
Summary Of Significant Accounting Policies [Line Items]        
Goodwill acquisitions 10,900,000      
Series A Preferred Stock
        
Summary Of Significant Accounting Policies [Line Items]        
Dividend Rate 6.00%      
Number of Series A Noncumulative Preferred Stock Shares 17,421 18,921    
Banking
        
Summary Of Significant Accounting Policies [Line Items]        
Discount rate used in goodwill impairment testing 30.00%      
Insurance
        
Summary Of Significant Accounting Policies [Line Items]        
Discount rate used in goodwill impairment testing 30.00%      
Impairment of goodwill 0 1,240,000    
Minimum
        
Summary Of Significant Accounting Policies [Line Items]        
Loan delinquent period 30 days      
Loan payments delinquency period beyond which loan is considered non-accrual 90 days      
Maximum
        
Summary Of Significant Accounting Policies [Line Items]        
Long-term equity investments ownership accounted for under cost method 20.00%      
Initial lease term 20 years      
Other Assets
        
Summary Of Significant Accounting Policies [Line Items]        
Cash surrender value of life insurance policies owned 46,240,000 44,390,000    
Net Deferred Tax Assets
        
Summary Of Significant Accounting Policies [Line Items]        
Cash surrender value of life insurance policies owned 23,790,000 18,880,000    
Core Deposits
        
Summary Of Significant Accounting Policies [Line Items]        
Weighted average remaining life of intangibles 5 years      
Core deposit intangibles 1,700,000 2,200,000    
Accumulated amortization of intangibles 6,240,000 5,740,000    
Core Deposits | Minimum
        
Summary Of Significant Accounting Policies [Line Items]        
Estimated lives of intangibles 1 year      
Core Deposits | Maximum
        
Summary Of Significant Accounting Policies [Line Items]        
Estimated lives of intangibles 6 years      
Furniture, Fixtures and Equipment | Minimum
        
Summary Of Significant Accounting Policies [Line Items]        
Premises and equipment, estimated useful life 5 years      
Furniture, Fixtures and Equipment | Maximum
        
Summary Of Significant Accounting Policies [Line Items]        
Premises and equipment, estimated useful life 10 years      
Software, Hardware, and Data Handling Equipment | Minimum
        
Summary Of Significant Accounting Policies [Line Items]        
Premises and equipment, estimated useful life 3 years      
Software, Hardware, and Data Handling Equipment | Maximum
        
Summary Of Significant Accounting Policies [Line Items]        
Premises and equipment, estimated useful life 5 years      
Building and Building Improvements | Minimum
        
Summary Of Significant Accounting Policies [Line Items]        
Premises and equipment, estimated useful life 10 years      
Building and Building Improvements | Maximum
        
Summary Of Significant Accounting Policies [Line Items]        
Premises and equipment, estimated useful life 40 years      
Land Improvements
        
Summary Of Significant Accounting Policies [Line Items]        
Premises and equipment, estimated useful life 20 years      
Reclassifications
        
Summary Of Significant Accounting Policies [Line Items]        
Overstatements of charge-offs   938,000 639,000 321,000
Adjustment of pre-tax income for the prior periods 2,390,000      
Investment in FHLB of Atlanta
        
Summary Of Significant Accounting Policies [Line Items]        
Investment owned, at cost 11,300,000 10,820,000    
FRB Richmond
        
Summary Of Significant Accounting Policies [Line Items]        
Investment owned, at cost $ 5,570,000 $ 4,780,000    
Consumer Loan | Minimum
        
Summary Of Significant Accounting Policies [Line Items]        
Loans charged against the allowance for loan losses, past due days 120 days      
Consumer Loan | Maximum
        
Summary Of Significant Accounting Policies [Line Items]        
Loans charged against the allowance for loan losses, past due days 180 days      
Other Loans
        
Summary Of Significant Accounting Policies [Line Items]        
Loans charged against the allowance for loan losses, past due days 120 days