Note 2 - Securities - Debt Securities by Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Due in one year or less, amortized cost	$ 85,205
Due in one year or less, fair value	84,389
Due from one to five years, amortized cost	529,700
Due from one to five years, fair value	516,624
Due from five to ten years, amortized cost	316,053
Due from five to ten years, fair value	303,308
Due after ten years, amortized cost	70,043
Due after ten years, fair value	71,020
Total, amortized cost	1,132,603	$ 793,422
Fair value	1,102,230	730,352
Collateralized Mortgage-Backed Securities [Member]
No single maturity, amortized cost	80,475
No single maturity, fair value	75,762
Total, amortized cost	80,475	31,696
Fair value	75,762	25,368
Other Debt and Equity Securities [Member]
No single maturity, amortized cost	51,127
No single maturity, fair value	51,127
Total, amortized cost	51,127	500
Fair value	$ 51,127	$ 500