Note 10 - FHLB Borrowings - FHLB Borrowings and Weighted Average Interest Rates (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Less than 1 year, amount	$ 825,000	$ 830,000
Less than 1 year, rate	5.08%	4.42%
1 year through less than 2 years, amount	$ 0	$ 0
1 year through less than 2 years, rate	0.00%	0.00%
2 years through less than 3 years, amount	$ 25,000	$ 25,000
2 years through less than 3 years, rate	1.00%	1.00%
3 years through less than 4 years, amount	$ 2,050	$ 2,050
3 years through less than 4 years, rate	2.23%	2.23%
4 years through 5 years, amount	$ 317	$ 326
4 years through 5 years, rate	2.85%	2.85%
After 5 years, amount	$ 318	$ 326
After 5 years, rate	2.96%	2.96%
FHLB borrowings - gross	$ 852,685	$ 857,702
FHLB borrowings - gross	4.95%	4.32%
Fair value discount	$ (74)	$ (80)
Borrowings	$ 852,611	$ 857,622