Note 2 - Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Total, amortized cost	$ 839,060	$ 793,422
Securities available for sale, gross unrealized gains	1,990	737
Securities available for sale, gross unrealized losses	(53,467)	(63,807)
Fair value	787,583	730,352
US Government Agencies Debt Securities [Member]
Total, amortized cost	583,732	542,676
Securities available for sale, gross unrealized gains	1,380	131
Securities available for sale, gross unrealized losses	(37,703)	(47,226)
Fair value	547,409	495,581
Collateralized Mortgage-Backed Securities [Member]
Total, amortized cost	30,848	31,696
Securities available for sale, gross unrealized gains	8	4
Securities available for sale, gross unrealized losses	(5,674)	(6,332)
Fair value	25,182	25,368
Municipal General Obligation Bonds [Member]
Total, amortized cost	192,160	187,484
Securities available for sale, gross unrealized gains	483	513
Securities available for sale, gross unrealized losses	(7,853)	(7,827)
Fair value	184,790	180,170
Municipal Revenue Bonds [Member]
Total, amortized cost	31,820	31,066
Securities available for sale, gross unrealized gains	119	89
Securities available for sale, gross unrealized losses	(2,237)	(2,422)
Fair value	29,702	28,733
Other Debt and Equity Securities [Member]
Total, amortized cost	500	500
Securities available for sale, gross unrealized gains	0	0
Securities available for sale, gross unrealized losses	0	0
Fair value	$ 500	$ 500

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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+ Details