Note 5 - Premises and Equipment - Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Land, buildings, and leasehold improvements	$ 60,980	$ 60,399
Furniture and equipment	19,020	18,188
Total premises and equipment	80,000	78,587
Less accumulated depreciation and amortization	49,072	46,687
Premises and equipment, net	$ 30,928	$ 31,900