Note 9 - FHLB Borrowings - FHLB Borrowings and Weighted Average Interest Rates (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Less than 1 year, amount	$ 660,529	$ 881,000
Less than 1 year, rate	4.51%	5.57%
1 year through less than 2 years, amount	$ 2,050	$ 25,000
1 year through less than 2 years, rate	2.23%	1.00%
2 years through less than 3 years, amount	$ 260	$ 2,050
2 years through less than 3 years	2.85%	2.23%
3 years through less than 4 years, amount	$ 25,000	$ 293
3 years through less than 4 years	4.18%	2.85%
4 years through 5 years, amount	$ 0	$ 25,000
4 years through 5 years, rate	0.00%	4.18%
After 5 years, amount	$ 261	$ 294
After 5 years, rate	2.96%	2.96%
FHLB borrowings (before discount)	$ 688,100	$ 933,637
FHLB borrowings (before discount), rate	4.49%	5.41%
Fair value discount	$ (36)	$ (58)
Borrowings	$ 688,064	$ 933,579