Note 4 - Securities - Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Temporarily impaired securities, less than 12 months, fair value	$ 7,838	$ 6,221
Temporarily impaired securities, less than 12 months unrealized loss	19	146
Temporarily impaired securities, 12 months or more fair value	561,880	577,726
Temporarily impaired securities, 12 months or more unrealized loss	64,235	78,476
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	303,421	311,124
Temporarily impaired securities, 12 months or more unrealized loss	29,833	40,012
US States and Political Subdivisions Debt Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	0	885
Temporarily impaired securities, less than 12 months unrealized loss	0	118
Temporarily impaired securities, 12 months or more fair value	148,236	144,849
Temporarily impaired securities, 12 months or more unrealized loss	29,546	32,254
Commercial Mortgage-Backed Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	7,838	5,336
Temporarily impaired securities, less than 12 months unrealized loss	19	28
Temporarily impaired securities, 12 months or more fair value	104,397	115,011
Temporarily impaired securities, 12 months or more unrealized loss	4,173	5,445
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	5,826	5,743
Temporarily impaired securities, 12 months or more unrealized loss	$ 683	764
US Treasury Securities [Member]
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.

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