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Note 19 - Derivative Financial Instruments (Details Textual)
xbrli-pure in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Junior Subordinated Notes, Total $ 41,849 $ 36,986  
Derivative Asset, Notional Amount 745,619 739,726  
Short-term Debt, Total 441,500 441,500  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total 100 100  
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 267,800 261,900  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Derivative Asset, Notional Amount 441,500 $ 441,500  
Derivative, Number of Instruments Held, Total   0  
Interest Rate Swap [Member]      
Derivative Asset, Notional Amount 286,100 $ 280,200  
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, Total $ 61,900 $ 61,900