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Note 2 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Securities available-for-sale, less than 12 months, fair value	$ 1,174	$ 38,141
Securities HTM, less than 12 months, fair value	0	396
Securities available-for-sale, less than 12 months, unrealized losses	(1)	(792)
Securities HTM, less than 12 months, unrealized losses	0	(6)
Securities available-for-sale, 12 months or more, fair value	694,100	746,233
Securities HTM, 12 months or more, fair value	183,379	340,798
Securities available-for-sale, 12 months or more, unrealized losses	(88,133)	(124,199)
Securities HTM, 12 months or more, unrealized losses	(19,311)	(28,810)
Securities available-for-sale, fair value	695,274	784,374
Securities HTM, fair value	183,379	341,194
Securities available-for-sale, unrealized losses	(88,134)	(124,991)
Securities HTM, unrealized losses	(19,311)	(28,816)
US Government-sponsored Enterprises Debt Securities [Member]
Securities available-for-sale, less than 12 months, fair value	0	5,801
Securities HTM, less than 12 months, fair value	0	396
Securities available-for-sale, less than 12 months, unrealized losses	0	(49)
Securities HTM, less than 12 months, unrealized losses	0	(6)
Securities available-for-sale, 12 months or more, fair value	70,992	74,478
Securities HTM, 12 months or more, fair value	21,713	22,965
Securities available-for-sale, 12 months or more, unrealized losses	(3,088)	(4,798)
Securities HTM, 12 months or more, unrealized losses	(1,285)	(2,028)
Securities available-for-sale, fair value	70,992	80,279
Securities HTM, fair value	21,713	23,361
Securities available-for-sale, unrealized losses	(3,088)	(4,847)
Securities HTM, unrealized losses	(1,285)	(2,034)
US Treasury Securities and US Government Agencies Debt Securities [Member]
Securities HTM, less than 12 months, fair value	0	0
Securities HTM, less than 12 months, unrealized losses	0	0
Securities HTM, 12 months or more, fair value	1,965	153,109
Securities HTM, 12 months or more, unrealized losses	(25)	(741)
Securities HTM, fair value	1,965	153,109
Securities HTM, unrealized losses	(25)	(741)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Securities available-for-sale, less than 12 months, fair value	0	23,159
Securities HTM, less than 12 months, fair value	0	0
Securities available-for-sale, less than 12 months, unrealized losses	0	(579)
Securities HTM, less than 12 months, unrealized losses	0	0
Securities available-for-sale, 12 months or more, fair value	528,631	567,818
Securities HTM, 12 months or more, fair value	159,701	164,724
Securities available-for-sale, 12 months or more, unrealized losses	(74,850)	(105,211)
Securities HTM, 12 months or more, unrealized losses	(18,001)	(26,041)
Securities available-for-sale, fair value	528,631	590,977
Securities HTM, fair value	159,701	164,724
Securities available-for-sale, unrealized losses	(74,850)	(105,790)
Securities HTM, unrealized losses	(18,001)	(26,041)
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale, less than 12 months, fair value	1,174	9,181
Securities available-for-sale, less than 12 months, unrealized losses	(1)	(164)
Securities available-for-sale, 12 months or more, fair value	93,924	101,407
Securities available-for-sale, 12 months or more, unrealized losses	(10,153)	(14,034)
Securities available-for-sale, fair value	95,098	110,588
Securities available-for-sale, unrealized losses	(10,154)	(14,198)
Other Debt Obligations [Member]
Securities available-for-sale, less than 12 months, fair value	0	0
Securities available-for-sale, less than 12 months, unrealized losses	0	0
Securities available-for-sale, 12 months or more, fair value	553	2,530
Securities available-for-sale, 12 months or more, unrealized losses	(42)	(156)
Securities available-for-sale, fair value	553	2,530
Securities available-for-sale, unrealized losses	$ (42)	$ (156)

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.

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