Note 7 - Premises and Equipment - Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, plant, and equipment, gross	$ 188,821	$ 186,168
Less: Accumulated depreciation/amortization	83,214	77,244
Premises and equipment, net	105,607	108,924
Land and Land Improvements [Member]
Property, plant, and equipment, gross	42,455	42,407
Building and Building Improvements [Member]
Property, plant, and equipment, gross	78,463	78,299
Furniture Fixtures and Equipment [Member]
Property, plant, and equipment, gross	51,654	50,378
Leasehold Improvements [Member]
Property, plant, and equipment, gross	15,546	14,546
Construction in Progress [Member]
Property, plant, and equipment, gross	$ 703	$ 538