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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2015
USD ($)
State
Branch
Segment
Location
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
shares
Summary Of Significant Accounting Policies [Line Items]      
Assets managed by the Company $ 742,000,000    
Assets $ 2,462,276,000 $ 2,607,936,000  
Number of business segment | Segment 1    
Carrying value and maximum potential loss exposure of VIEs $ 934,000 1,260,000  
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 reserve based on historical loss rate $ 250,000    
Operating lease term 20 years    
Reporting units | Segment 2    
Cash dividend Payment Period 3 years    
Carrying value and maximum potential loss of equity investments $ 0 360,000  
Each share convertible into shares | shares 69    
Redemption of preferred stock, shares | shares 2,367    
Redemption of preferred stock $ 2,367,000    
Investment in FHLB of Atlanta      
Summary Of Significant Accounting Policies [Line Items]      
Investment owned, at cost 5,090,000 6,370,000  
FRB Richmond Stock      
Summary Of Significant Accounting Policies [Line Items]      
Investment owned, at cost $ 5,640,000 $ 5,580,000  
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Loan delinquent period 30 days    
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    
GreenPoint Insurance Group      
Summary Of Significant Accounting Policies [Line Items]      
Number of locations the Company provides services | Location 9    
First Community Bank      
Summary Of Significant Accounting Policies [Line Items]      
Number of operating branches | Branch 50    
Number of states the company provides services | State 4    
Series A Preferred Stock      
Summary Of Significant Accounting Policies [Line Items]      
Dividend Rate 6.00%    
Number of preferred stock converted | shares 12,784    
Redemption of preferred stock, shares | shares 2,367    
Redemption of preferred stock $ 2,370,000    
Accrued and unpaid dividends $ 9,000    
Number of Series A Noncumulative Preferred Stock Shares | shares 0 15,151 15,251