Note 12 - Derivative Financial Instruments (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Floating Rate Junior Subordinated Debentures [Member]
Derivative, Amount of Hedged Item	$ 18,000	$ 18,000
Junior Subordinated Notes	61,900	61,900
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative Asset, Notional Amount	36,321	36,321
Not Designated as Hedging Instrument [Member]
Derivative Asset, Notional Amount	36,300	36,300
Designated as Hedging Instrument [Member]
Derivative Asset, Notional Amount	159,200	128,500
Interest Rate Swap [Member]
Derivative Asset, Notional Amount	177,500	146,900
Derivative Asset, Notional Amount	$ 195,487	$ 164,864