Note 5 - Investment Securities - Schedule of Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Due within one year or less, Held-to-maturity, Amortized Cost	$ 6,801
Due within one year or less, Held-to-maturity, Fair Value	6,730
Due within one year or less, Available-for-sale, Amortized Cost	14,976
Due within one year or less, Available-for-sale, Fair Value	14,980
Due after one year through five years, Held-to-maturity, Amortized Cost	54,832
Due after one year through five years, Held-to-maturity, Fair Value	50,924
Due after one year through five years, Available-for-sale, Amortized Cost	16,710
Due after one year through five years, Available-for-sale, Fair Value	16,622
Due after five years through ten years, Held-to-maturity, Amortized Cost	48,016
Due after five years through ten years, Held-to-maturity, Fair Value	41,694
Due after five years through ten years, Available-for-sale, Amortized Cost	57,990
Due after five years through ten years, Available-for-sale, Fair Value	52,374
Due after 10 years, Held-to-maturity, Amortized Cost	9,974
Due after 10 years, Held-to-maturity, Fair Value	8,637
Due after 10 years, Available-for-sale, Amortized Cost	370
Due after 10 years, Available-for-sale, Fair Value	371
Held-to-maturity, Amortized Cost	119,623
Held-to-maturity, Fair Value	107,985
Available-for-sale, Amortized Cost	90,046
Available-for-sale, Fair Value	84,347
Total investment securities	275,716
Total investment securities, Held-to-maturity, Fair Value	236,986	$ 258,617
Total investment securities, Available-for-sale, Amortized Cost	686,556	584,754
Total investment securities, Available-for-sale, Fair Value	588,053	486,736
Residential Mortgage-Backed Securities [Member]
Residential agency, Held-to-maturity, Amortized Cost	156,093
Residential agency, Held-to-maturity, Fair Value	129,001
Residential agency, Available-for-sale, Amortized Cost	596,510
Residential agency, Available-for-sale, Fair Value	503,706
Total investment securities, Held-to-maturity, Fair Value	129,001	141,627
Total investment securities, Available-for-sale, Fair Value	$ 503,706	$ 435,594