Note 3 - Securities - Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Temporarily impaired securities, less than 12 months, fair value	$ 6,221	$ 2,500
Temporarily impaired securities, less than 12 months unrealized loss	146	27
Temporarily impaired securities, 12 months or more fair value	577,726	615,242
Temporarily impaired securities, 12 months or more unrealized loss	78,476	79,158
US Government Agencies Debt Securities [Member]
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	311,124	311,844
Temporarily impaired securities, 12 months or more unrealized loss	40,012	42,060
US States and Political Subdivisions Debt Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	885	884
Temporarily impaired securities, less than 12 months unrealized loss	118	1
Temporarily impaired securities, 12 months or more fair value	144,849	148,763
Temporarily impaired securities, 12 months or more unrealized loss	32,254	29,613
Commercial Mortgage-Backed Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	5,336	1,616
Temporarily impaired securities, less than 12 months unrealized loss	28	26
Temporarily impaired securities, 12 months or more fair value	115,011	147,922
Temporarily impaired securities, 12 months or more unrealized loss	5,445	6,698
Corporate Debt Securities [Member]
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	5,743	5,750
Temporarily impaired securities, 12 months or more unrealized loss	764	754
US Treasury Securities [Member]
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	999	963
Temporarily impaired securities, 12 months or more unrealized loss	$ 1	$ 33

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.

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