Note 19 - Derivative Financial Instruments (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Junior Subordinated Notes	$ 33,959	$ 29,018
Derivative Asset, Notional Amount	253,414	164,864
Unrealized Gain (Loss) on Derivatives	0	0
Derivative, Net Hedge Ineffectiveness Gain (Loss)	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	217,100	128,500
Interest Rate Swap [Member]
Derivative Asset, Notional Amount	235,400	146,900
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Asset, Notional Amount	182,177	28,588
Floating Rate Junior Subordinated Debentures [Member]
Derivative, Amount of Hedged Item	18,000	18,000
Junior Subordinated Notes	$ 61,900	$ 61,900