Note 8 - FHLB Borrowings - FHLB Borrowings and Weighted Average Interest Rates (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Less than 1 year, amount	$ 830,000	$ 390,549
Less than 1 year, rate	4.42%	0.56%
1 year through less than 2 years, amount	$ 0	$ 50,000
1 year through less than 2 years, rate	0.00%	1.84%
2 years through less than 3 years, amount	$ 25,000	$ 0
2 years through less than 3 years, rate	1.00%
3 years through less than 4 years, amount	$ 2,050	$ 25,000
3 years through less than 4 years, rate	2.23%	1.00%
4 years through 5 years, amount	$ 326	$ 2,050
4 years through 5 years, rate	2.85%	2.23%
After 5 years, amount	$ 326	$ 714
After 5 years, rate	2.96%	2.91%
FHLB borrowings - (before discount)	$ 857,702	$ 468,313
FHLB borrowings - (before discount), rate	4.32%	0.73%
Fair value discount	$ (80)	$ (120)
FHLB borrowings (after discount)	$ 857,622	$ 468,193