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Investment Securities - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 Securities | Mar. 31, 2012 | Dec. 31, 2012 Securities
Investment Securities [Line Items] |  |  |
Number of securities in an unrealized loss position | 78 |  | 57
Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio | 2.73% |  | 2.78%
Carrying value of securities pledged | $ 280,880,000 |  | $ 292,880,000
OTTI charges incurred | 0 | 0 |
Reduced severity rate | 15.00% |  |
Severity rate reduction period | 7 years |  |
FHLBA Stock |  |  |
Investment Securities [Line Items] |  |  |
Investment owned at fair value | 10,000,000 |  | 11,300,000
FRB Richmond Stock |  |  |
Investment Securities [Line Items] |  |  |
Investment owned at fair value | 5,580,000 |  | 5,580,000
Mortgage-backed securities Non-Agency Alt-A residential |  |  |
Investment Securities [Line Items] |  |  |
Voluntary constant prepayment rate | 5.00% |  |
Constant default rate scenario | 20.00% |  |
Remaining underlying mortgages default period | 3 years |  |
Severity rate | 71.00% |  |
Equity Securities |  |  |
Investment Securities [Line Items] |  |  |
OTTI charges incurred | $ 0 | $ 0 |

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