Note 7 - Premises and Equipment - Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, plant, and equipment, gross	$ 211,730	$ 208,435
Less: Accumulated depreciation	120,633	113,659
Premises and equipment, net	91,097	94,776
Land and Land Improvements [Member]
Property, plant, and equipment, gross	42,566	42,566
Building and Building Improvements [Member]
Property, plant, and equipment, gross	81,796	81,613
Furniture Fixtures and Equipment [Member]
Property, plant, and equipment, gross	68,371	65,872
Leasehold Improvements [Member]
Property, plant, and equipment, gross	18,056	18,009
Construction in Progress [Member]
Property, plant, and equipment, gross	$ 941	$ 375