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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

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