Note 8 - FHLB Borrowings - FHLB Borrowings and Weighted Average Interest Rates (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Less than 1 year, amount	$ 881,000	$ 830,000
Less than 1 year, rate	5.57%	4.42%
1 year through less than 2 years, amount	$ 25,000	$ 0
1 year through less than 2 years, rate	1.00%	0.00%
2 years through less than 3 years, amount	$ 2,050	$ 25,000
2 years through less than 3 years	2.23%	1.00%
3 years through less than 4 years, amount	$ 293	$ 2,050
3 years through less than 4 years	2.85%	2.23%
4 years through 5 years, amount	$ 25,000	$ 326
4 years through 5 years, rate	4.18%	2.85%
After 5 years, amount	$ 294	$ 326
After 5 years, rate	2.96%	2.96%
FHLB borrowings (before discount)	$ 933,637	$ 857,702
FHLB borrowings (before discount)	5.41%	4.32%
Fair value discount	$ (58)	$ (80)
Borrowings	$ 933,579	$ 857,622