Note 5 - Premises and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment, Gross	$ 73,956	$ 66,523
Less: accumulated depreciation, amortization and fair value adjustments	43,177	38,723
Bank premises and equipment, net	30,779	27,800
Land [Member]
Property, Plant and Equipment, Gross	6,732	6,732
Building [Member]
Property, Plant and Equipment, Gross	$ 11,043	9,797
Building [Member] | Minimum [Member]
Estimated useful life (Year)	10 years
Building [Member] | Maximum [Member]
Estimated useful life (Year)	25 years
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross	$ 28,548	24,830
Furniture and Fixtures [Member] | Minimum [Member]
Estimated useful life (Year)	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Estimated useful life (Year)	7 years
Leasehold Improvements [Member]
Property, Plant and Equipment, Gross	$ 27,633	$ 25,164
Leasehold Improvements [Member] | Minimum [Member]
Estimated useful life (Year)	10 years
Leasehold Improvements [Member] | Maximum [Member]
Estimated useful life (Year)	20 years