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Note 4 - Fair Value Disclosure Measurements (Detail) - Additional Quantitative Information About Assets Measured at Fair Value on Non-Recurring Basis (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Appraisal Adjustments [Member] | Impaired Loans [Member]
   
Estimate $ 16,363 [1],[2] $ 17,600 [1],[2]
Appraisal of Collateral [Member] | Other Real Estate Owned [Member]
   
Estimate $ 2,155 [1],[3] $ 1,846 [1],[3]
[1] Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs which are not identifiable.
[2] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal.
[3] Includes qualitative adjustments by management and estimated liquidation expenses.