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Note 11 - Derivative Financial Instruments (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Short-term Debt $ 50,000   $ 50,000    
Derivative Asset, Notional Amount 345,747   345,747   $ 253,414
Derivative, Net Hedge Ineffectiveness Gain (Loss) 0 $ 0 0 $ 0  
Junior Subordinated Notes 35,137   35,137   33,959
Not Designated as Hedging Instrument [Member]          
Derivative Asset, Notional Amount 36,300   36,300   36,300
Designated as Hedging Instrument [Member]          
Derivative Asset, Notional Amount 259,400   259,400   217,100
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]          
Derivative Asset, Notional Amount 50,000   50,000   0
Interest Rate Swap [Member]          
Derivative Asset, Notional Amount 277,700   277,700   235,400
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]          
Derivative Asset, Notional Amount 50,000   50,000  
Floating Rate Junior Subordinated Debentures [Member]          
Derivative, Amount of Hedged Item 18,000   18,000   18,000
Junior Subordinated Notes $ 61,900   $ 61,900   $ 61,900