Note 16 - Balance Sheet Offsetting - Financial Instruments that are Eligible for Offset in the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivative assets, gross	$ 2,314	$ 938
Derivative assets, net	2,314	938
Derivative assets not offset	2,314	938
Securities sold under agreements to repurchase	100,000	350,000
Securities sold under agreements to repurchase, net	100,000	350,000
Securities sold under agreements to repurchase, collateral posted	(100,000)	(350,000)
Derivative liabilities, gross	5,049	3,744
Derivative liabilities, net	5,049	3,744
Derivatives, collateral posted	$ (5,049)	$ (3,744)