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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]      
Assets managed by the Company $ 706,000,000    
Assets 2,602,514,000 2,728,867,000  
Number of business segment 1    
Carrying value and maximum potential loss exposure of VIEs 2,890,000 3,040,000  
Special assets staff reviews loans, amount 250,000    
Loan payments delinquency period beyond which loan is considered non-accrual 90 days    
TDRs evaluated for specific reserve based on collateral or net present value method 250,000    
TDRs subject to resrve based on historical loss rate 250,000    
Operating lease term 20 years    
Reporting units 2    
Carrying value and maximum potential loss of equity investments 786,000 782,000  
Each share convertible into shares 69    
Minimum time for conversion 5 years    
Date for redeem shares at face value May 20, 2014    
Series A Preferred Stock
      
Summary Of Significant Accounting Policies [Line Items]      
Dividend Rate 6.00%    
Number of Series A Noncumulative Preferred Stock Shares 15,251 17,421 18,921
Investment in FHLB of Atlanta
      
Summary Of Significant Accounting Policies [Line Items]      
Investment owned, at cost 10,720,000 11,300,000  
FRB Richmond Stock
      
Summary Of Significant Accounting Policies [Line Items]      
Investment owned, at cost $ 5,580,000 $ 5,570,000  
Minimum
      
Summary Of Significant Accounting Policies [Line Items]      
Loan delinquent period 30 days    
Long-term investments in various entities, ownership interests 20.00%    
Maximum
      
Summary Of Significant Accounting Policies [Line Items]      
Long-term investments in various entities, ownership interests 50.00%    
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    
Consumer Loan
      
Summary Of Significant Accounting Policies [Line Items]      
Loans charged against the allowance for loan losses, past due days 120 days    
Consumer Loan | Residential Real Estate
      
Summary Of Significant Accounting Policies [Line Items]      
Loans charged against the allowance for loan losses, past due days 180 days    
Consumer Loan | Unsecured Loan
      
Summary Of Significant Accounting Policies [Line Items]      
Loans charged against the allowance for loan losses, past due days 90 days    
Other Loans
      
Summary Of Significant Accounting Policies [Line Items]      
Loans charged against the allowance for loan losses, past due days 120 days    
First Community Bank
      
Summary Of Significant Accounting Policies [Line Items]      
Number of locations the Company provides services 71    
GreenPoint Insurance Group
      
Summary Of Significant Accounting Policies [Line Items]      
Number of locations the Company provides services 9