Note 8 - Premises and Equipment (Details) - Premises and Equipment - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 186,168	$ 170,089
Less: Accumulated depreciation/amortization	77,244	70,407
Premises and equipment, net	108,924	99,682
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	42,407	33,543
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	78,299	74,550
Furniture Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	50,378	47,936
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	14,546	14,006
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 538	$ 54