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Note 4 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Securities available-for-sale, amortized costs	$ 685,472	$ 697,786
Securities available-for-sale, gross unrealized gains	53	0
Securities available-for-sale, gross unrealized losses	63,254	79,185
Securities available-for-sale, fair values	622,271	618,601
US Government Agencies Debt Securities [Member]
Securities available-for-sale, amortized costs	353,077	353,904
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	32,645	42,060
Securities available-for-sale, fair values	320,432	311,844
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale, amortized costs	178,270	179,507
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	25,542	29,614
Securities available-for-sale, fair values	152,728	149,893
Collateralized Mortgage-Backed Securities [Member]
Securities available-for-sale, amortized costs	146,619	156,875
Securities available-for-sale, gross unrealized gains	53	0
Securities available-for-sale, gross unrealized losses	4,427	6,724
Securities available-for-sale, fair values	142,245	150,151
Corporate Debt Securities [Member]
Securities available-for-sale, amortized costs	6,507	6,504
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	631	754
Securities available-for-sale, fair values	5,876	5,750
US Treasury Securities [Member]
Securities available-for-sale, amortized costs	999	996
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	9	33
Securities available-for-sale, fair values	$ 990	$ 963

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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