Note 8 - Premises and Equipment (Details) - Premises and Equipment (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 170,089	$ 165,388
Less: Accumulated depreciation/amortization	70,407	63,343
Premises and equipment, net	99,682	102,045
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	33,543	33,441
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	74,550	73,756
Furniture Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	47,936	44,278
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	14,006	12,753
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 54	$ 1,160