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Note 20 - Assets and Liabilities Measured and Reported at Fair Value (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Impaired Financing Receivable, with Related Allowance, Recorded Investment $ 2,660   $ 2,602
Impaired Financing Receivable, Related Allowance 1,267   544
Other Real Estate, Foreclosed Assets, and Repossessed Assets 5,033 $ 5,000 4,541
Mortgage Servicing Rights [Member]      
Impaired Financing Receivable, Related Allowance 0   0
Fair Value, Measurements, Recurring [Member]      
Assets, Fair Value Disclosure 570,252   566,337
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]      
Assets, Fair Value Disclosure 0   0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0   0
Impaired Loans [Member] | Appraisal Discount Method [Member]      
Assets, Fair Value Disclosure 1,400   $ 2,100
Impaired Loans [Member] | Appraisal Discount Method [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure $ 1,393