Note 11 - FHLB Advances - Maturity and Interest Rate Information on Advances from FHLB (Details) - Federal Home Loan Bank, Advances, Putable Option - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Amount due within one year		$ 415,000
Weighted average interest rate at year-end - next 12 months		4.58%
Amount due - one to two years after balance sheet date	$ 300,000
Weighted average interest rate at year-end - year two	5.64%
Amount due - three to four years after balance sheet date	$ 45,000
Weighted average interest rate at year-end - year four	5.01%
Amount due - four to five years after balance sheet date	$ 45,000
Weighted average interest rate at year-end - year five	4.82%
Amount due - five to six years after balance sheet date	$ 45,000
Weighted average interest rate at year-end - year six	4.64%
Total FHLB advances, Amount due	$ 435,000	$ 415,000
Total FHLB advances, Weighted average interest rate at year-end	5.39%	4.58%