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Note 4 - Investment Securities - Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Temporarily impaired securities, fair value	$ 545,720	$ 554,720
Temporarily impaired securities, unrealized losses	(89,079)	(96,074)
Temporarily impaired securities, fair value, less than 12 months	54,761	60,543
Temporarily impaired securities, unrealized losses, less than 12 months	(1,119)	(1,004)
Temporarily impaired securities, fair value, 12 months or longer	490,959	494,177
Temporarily impaired securities, unrealized losses, 12 months or longer	(87,960)	(95,070)
US Government Agencies Debt Securities [Member]
Temporarily impaired securities, fair value	56,703	53,467
Temporarily impaired securities, unrealized losses	(10,690)	(11,674)
Temporarily impaired securities, fair value, less than 12 months	21,699	18,471
Temporarily impaired securities, unrealized losses, less than 12 months	(72)	(60)
Temporarily impaired securities, fair value, 12 months or longer	35,004	34,996
Temporarily impaired securities, unrealized losses, 12 months or longer	(10,618)	(11,614)
Residential Mortgage-Backed Securities [Member]
Temporarily impaired securities, fair value	351,709	364,971
Temporarily impaired securities, unrealized losses	(53,392)	(60,818)
Temporarily impaired securities, fair value, less than 12 months	13,622	26,809
Temporarily impaired securities, unrealized losses, less than 12 months	(297)	(604)
Temporarily impaired securities, fair value, 12 months or longer	338,087	338,162
Temporarily impaired securities, unrealized losses, 12 months or longer	(53,095)	(60,214)
Commercial Mortgage-Backed Securities [Member]
Temporarily impaired securities, fair value	21,051	20,892
Temporarily impaired securities, unrealized losses	(3,874)	(4,097)
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	21,051	20,892
Temporarily impaired securities, unrealized losses, 12 months or longer	(3,874)	(4,097)
US States and Political Subdivisions Debt Securities [Member]
Temporarily impaired securities, fair value	115,666	112,523
Temporarily impaired securities, unrealized losses	(21,116)	(19,460)
Temporarily impaired securities, fair value, less than 12 months	19,440	13,281
Temporarily impaired securities, unrealized losses, less than 12 months	(750)	(322)
Temporarily impaired securities, fair value, 12 months or longer	96,226	99,242
Temporarily impaired securities, unrealized losses, 12 months or longer	(20,366)	(19,138)
Corporate Debt Securities [Member]
Temporarily impaired securities, fair value	0	1,982
Temporarily impaired securities, unrealized losses	0	(18)
Temporarily impaired securities, fair value, less than 12 months		1,982
Temporarily impaired securities, unrealized losses, less than 12 months		(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	591	885
Temporarily impaired securities, unrealized losses	(7)	(7)
Temporarily impaired securities, fair value, less than 12 months		0
Temporarily impaired securities, unrealized losses, less than 12 months		0
Temporarily impaired securities, fair value, 12 months or longer	591	885
Temporarily impaired securities, unrealized losses, 12 months or longer	$ (7)	$ (7)

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