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Summary of Interest Recognized and Cash-Basis Interest Earned on Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | 12 Months Ended |
|---|---|---|---|
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Sep. 30, 2012
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Sep. 30, 2012
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Dec. 31, 2011
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| Financing Receivable, Impaired [Line Items] | |||
| Average of individually impaired loans during period | $ 2,719 | $ 2,690 | $ 4,185 |
| Interest income recognized during impairment | 7 | 39 | 134 |
| Cash-basis interest income recognized | $ 5 | $ 39 |