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Note 4 - Investment Securities - Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Temporarily impaired securities, fair value	$ 623,417	$ 554,720
Temporarily impaired securities, unrealized losses	(75,297)	(96,074)
Temporarily impaired securities, fair value, less than 12 months	135,704	60,543
Temporarily impaired securities, unrealized losses, less than 12 months	(824)	(1,004)
Temporarily impaired securities, fair value, 12 months or longer	487,713	494,177
Temporarily impaired securities, unrealized losses, 12 months or longer	(74,473)	(95,070)
US Government Agencies Debt Securities [Member]
Temporarily impaired securities, fair value	140,370	53,467
Temporarily impaired securities, unrealized losses	(10,114)	(11,674)
Temporarily impaired securities, fair value, less than 12 months	106,573	18,471
Temporarily impaired securities, unrealized losses, less than 12 months	(484)	(60)
Temporarily impaired securities, fair value, 12 months or longer	33,797	34,996
Temporarily impaired securities, unrealized losses, 12 months or longer	(9,630)	(11,614)
Residential Mortgage-Backed Securities [Member]
Temporarily impaired securities, fair value	343,660	364,971
Temporarily impaired securities, unrealized losses	(45,857)	(60,818)
Temporarily impaired securities, fair value, less than 12 months	8,843	26,809
Temporarily impaired securities, unrealized losses, less than 12 months	(49)	(604)
Temporarily impaired securities, fair value, 12 months or longer	334,817	338,162
Temporarily impaired securities, unrealized losses, 12 months or longer	(45,808)	(60,214)
Commercial Mortgage-Backed Securities [Member]
Temporarily impaired securities, fair value	26,807	20,892
Temporarily impaired securities, unrealized losses	(3,373)	(4,097)
Temporarily impaired securities, fair value, less than 12 months	5,422	0
Temporarily impaired securities, unrealized losses, less than 12 months	(42)	0
Temporarily impaired securities, fair value, 12 months or longer	21,385	20,892
Temporarily impaired securities, unrealized losses, 12 months or longer	(3,331)	(4,097)
US States and Political Subdivisions Debt Securities [Member]
Temporarily impaired securities, fair value	108,288	112,523
Temporarily impaired securities, unrealized losses	(15,950)	(19,460)
Temporarily impaired securities, fair value, less than 12 months	10,867	13,281
Temporarily impaired securities, unrealized losses, less than 12 months	(248)	(322)
Temporarily impaired securities, fair value, 12 months or longer	97,421	99,242
Temporarily impaired securities, unrealized losses, 12 months or longer	(15,702)	(19,138)
Corporate Debt Securities [Member]
Temporarily impaired securities, fair value	3,999	1,982
Temporarily impaired securities, unrealized losses	(1)	(18)
Temporarily impaired securities, fair value, less than 12 months	3,999	1,982
Temporarily impaired securities, unrealized losses, less than 12 months	(1)	(18)
Temporarily impaired securities, fair value, 12 months or longer	0	0
Temporarily impaired securities, unrealized losses, 12 months or longer	0	0
Asset-Backed Securities [Member]
Temporarily impaired securities, fair value	293	885
Temporarily impaired securities, unrealized losses	(2)	(7)
Temporarily impaired securities, fair value, less than 12 months	0	0
Temporarily impaired securities, unrealized losses, less than 12 months	0	0
Temporarily impaired securities, fair value, 12 months or longer	293	885
Temporarily impaired securities, unrealized losses, 12 months or longer	$ (2)	$ (7)

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