Note 23 - Balance Sheet Offsetting (Details) - Financial Instruments That Are Eligible for Offset in the Consolidated Balance Sheet - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Liabilities:
Securities sold under agreements to repurchase, gross	$ 400,000	$ 450,000
Securities sold under agreements to repurchase, net	400,000	450,000
Securities sold under agreements to repurchase, collateral posted	(400,000)	(450,000)
Derivatives, gross	6,496	4,626
Derivatives, net	6,496	4,626
Derivatives, collateral posted	$ (6,496)	$ (4,626)