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Note 11 - Fair Value of Financial Instruments - Assets and Liabilities Carried at Fair Value on a Non-recurring Basis, and the Method Used to Determine Their Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member]    
Assets
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member]    
Assets
Fair Value, Inputs, Level 1 [Member]    
Assets
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member]    
Assets
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member]    
Assets
Fair Value, Inputs, Level 2 [Member]    
Assets
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]    
Assets 12,144 15,360
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]    
Assets 2,839 4,932
Fair Value, Inputs, Level 3 [Member]    
Assets 14,983 20,292
Impaired Loans [Member]    
Assets 12,144 15,360
Other Real Estate Owned [Member]    
Assets 2,839 4,932
Assets $ 14,983 $ 20,292