Note 7 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Goodwill	$ 375,696		$ 375,696		$ 375,696
Goodwill, Impairment Loss					$ 0
Intangible Asset, Finite-Lived, Impairment Loss		$ 0	0	$ 0
Intangible Asset, Finite-Lived, Amortization Expense	218	229	653	729
Core Deposits [Member]
Intangible Asset, Finite-Lived, Amortization Expense	$ 218	$ 229	$ 653	$ 729