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Fair Value of Assets and Liabilities - Additional Information (Detail) (Other Real Estate Owned, USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2012
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Dec. 31, 2011
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Assets measured at fair value on a nonrecurring basis | $ 8,008 | $ 4,353 |
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Significant Other Observable Inputs (Level 2)
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Assets measured at fair value on a nonrecurring basis | $ 8,000 | $ 4,353 |