Note 3 - Securities - Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Marketable Securities [Line Items]
Temporarily impaired securities, less than 12 months, fair value	$ 57,666	$ 6,221
Temporarily impaired securities, less than 12 months unrealized loss	587	146
Temporarily impaired securities, 12 months or more fair value	544,117	577,726
Temporarily impaired securities, 12 months or more unrealized loss	51,394	78,476
US Government Agencies Debt Securities [Member]
Marketable Securities [Line Items]
Temporarily impaired securities, less than 12 months, fair value	0	0
Temporarily impaired securities, less than 12 months unrealized loss	0	0
Temporarily impaired securities, 12 months or more fair value	288,055	311,124
Temporarily impaired securities, 12 months or more unrealized loss	24,298	40,012
US States and Political Subdivisions Debt Securities [Member]
Marketable Securities [Line Items]
Temporarily impaired securities, less than 12 months, fair value	1,680	885
Temporarily impaired securities, less than 12 months unrealized loss	364	118
Temporarily impaired securities, 12 months or more fair value	151,652	144,849
Temporarily impaired securities, 12 months or more unrealized loss	23,372	32,254
Commercial Mortgage-Backed Securities [Member]
Marketable Securities [Line Items]
Temporarily impaired securities, less than 12 months, fair value	55,986	5,336
Temporarily impaired securities, less than 12 months unrealized loss	223	28
Temporarily impaired securities, 12 months or more fair value	99,446	115,011
Temporarily impaired securities, 12 months or more unrealized loss	3,183	5,445
Corporate Debt Securities [Member]
Marketable Securities [Line Items]
Temporarily impaired securities, less than 12 months, fair value	0	0
Temporarily impaired securities, less than 12 months unrealized loss	0	0
Temporarily impaired securities, 12 months or more fair value	4,964	5,743
Temporarily impaired securities, 12 months or more unrealized loss	$ 541	764
US Treasury Securities [Member]
Marketable Securities [Line Items]
Temporarily impaired securities, less than 12 months, fair value		0
Temporarily impaired securities, less than 12 months unrealized loss		0
Temporarily impaired securities, 12 months or more fair value		999
Temporarily impaired securities, 12 months or more unrealized loss		$ 1

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
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