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Note 3 - Investment Securities Available for Sale - Investment Securities With Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Less than 12 months fair value $ 28,449 $ 182,187
Less than 12 months unrealized losses 257 3,093
12 months or more fair value 204,764 200,701
12 months or more unrealized losses 27,309 33,135
Total fair value 233,213 382,888
Total unrealized losses 27,566 36,228
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member]    
Less than 12 months fair value 5,916 107,328
Less than 12 months unrealized losses 22 1,917
12 months or more fair value 92,489 94,506
12 months or more unrealized losses 9,726 13,539
Total fair value 98,405 201,834
Total unrealized losses 9,748 15,456
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member]    
Less than 12 months fair value 8,193 55,921
Less than 12 months unrealized losses 36 926
12 months or more fair value 64,400 57,735
12 months or more unrealized losses 9,893 11,030
Total fair value 72,593 113,656
Total unrealized losses 9,929 11,956
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months fair value 14,340 18,938
Less than 12 months unrealized losses 199 250
12 months or more fair value 47,875 48,460
12 months or more unrealized losses 7,690 8,566
Total fair value 62,215 67,398
Total unrealized losses $ 7,889 $ 8,816