Note 3 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Marketable Securities [Line Items]
Securities available-for-sale, amortized costs	$ 702,023	$ 706,229
Securities available-for-sale, gross unrealized gains	353	129
Securities available-for-sale, gross unrealized losses	49,716	51,981
Securities available-for-sale, fair values	652,660	654,377
US Government Agencies Debt Securities [Member]
Marketable Securities [Line Items]
Securities available-for-sale, amortized costs	190,735	312,353
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	20,599	24,298
Securities available-for-sale, fair values	170,136	288,055
US States and Political Subdivisions Debt Securities [Member]
Marketable Securities [Line Items]
Securities available-for-sale, amortized costs	177,135	177,453
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	24,406	23,736
Securities available-for-sale, fair values	152,729	153,717
Collateralized Mortgage-Backed Securities [Member]
Marketable Securities [Line Items]
Securities available-for-sale, amortized costs	329,651	210,918
Securities available-for-sale, gross unrealized gains	353	129
Securities available-for-sale, gross unrealized losses	4,173	3,406
Securities available-for-sale, fair values	325,831	207,641
Corporate Debt Securities [Member]
Marketable Securities [Line Items]
Securities available-for-sale, amortized costs	4,502	5,505
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	538	541
Securities available-for-sale, fair values	$ 3,964	$ 4,964

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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+ Details

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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