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Note 6 - Debt and Equity Securities (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Proceeds from Sale of Available-for-sale Securities $ 126,000 $ 163,000 $ 112,400
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 19,538 0  
Trading Securities 0 0  
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 0 0  
Non-qualified Deferred Compensation Plan [Member] | Other Assets [Member]      
Defined Benefit Plan, Assets for Plan Benefits $ 15,700 $ 14,800  
Collateralized By Commercial Real Estate [Member] | Collateralized Mortgage Obligations [Member]      
Private Issue Collateralized Mortgage Obligations, Number 1 1  
Mortgage Backed Securities Available for Sale Amortized Cost $ 200 $ 7,700