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Note 19 - Derivative Financial Instruments (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Junior Subordinated Notes $ 36,986 $ 33,959  
Derivative Asset, Notional Amount 739,726 253,414  
Short-term Debt 441,500    
Derivative, Net Hedge Ineffectiveness Gain (Loss) 0 0 $ 0
Not Designated as Hedging Instrument [Member]      
Derivative Asset, Notional Amount 36,300 36,300  
Designated as Hedging Instrument [Member]      
Derivative Asset, Notional Amount 261,900 217,100  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Derivative Asset, Notional Amount 441,500 0  
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 200    
Interest Rate Swap [Member]      
Derivative Asset, Notional Amount 280,200 235,400  
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Derivative Asset, Notional Amount 36,321 36,321  
Floating Rate Junior Subordinated Debentures [Member]      
Derivative, Amount of Hedged Item 18,000 18,000  
Junior Subordinated Notes $ 61,900 $ 61,900