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Note 17 - Fair Value Disclosure Measurements (Detail) - Assets Measured on a Nonrecurring Basis (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Assets measured on a non-recurring basis:    
Impaired loans $ 21,288 $ 14,453
Fair Value, Inputs, Level 3 [Member]
   
Assets measured on a non-recurring basis:    
Impaired loans 17,600 13,581
Other real estate owned 1,846 2,196
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Assets measured on a non-recurring basis:    
Impaired loans 17,600 13,581
Other real estate owned $ 1,846 $ 2,196