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Note 5 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Less than 12 months, estimated fair value $ 28,024 $ 30,256
Less than 12 months, unrealized losses $ (273) $ (421)
Less than 12 months, securities 25 38
12 months or more, estimated fair value $ 517,957 $ 606,162
12 months or more, unrealized losses $ (29,328) $ (51,652)
12 months or more, securities 723 832
Total estimated fair value $ 545,981 $ 636,418
Total unrealized losses (29,601) (52,073)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value 0 5,466
Less than 12 months, unrealized losses $ 0 $ (43)
Less than 12 months, securities 0 2
12 months or more, estimated fair value $ 117,197 $ 159,321
12 months or more, unrealized losses $ (4,410) $ (8,733)
12 months or more, securities 68 94
Total estimated fair value $ 117,197 $ 164,787
Total unrealized losses (4,410) (8,776)
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 13,331 3,953
Less than 12 months, unrealized losses $ (90) $ (34)
Less than 12 months, securities 8 2
12 months or more, estimated fair value $ 65,022 $ 77,166
12 months or more, unrealized losses $ (2,782) $ (5,160)
12 months or more, securities 56 70
Total estimated fair value $ 78,353 $ 81,119
Total unrealized losses (2,872) (5,194)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Less than 12 months, estimated fair value 10,919 3,740
Less than 12 months, unrealized losses $ (59) $ (64)
Less than 12 months, securities 9 5
12 months or more, estimated fair value $ 79,653 $ 86,870
12 months or more, unrealized losses $ (8,577) $ (12,856)
12 months or more, securities 147 154
Total estimated fair value $ 90,572 $ 90,610
Total unrealized losses (8,636) (12,920)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 2,274 13,944
Less than 12 months, unrealized losses $ (117) $ (253)
Less than 12 months, securities 6 25
12 months or more, estimated fair value $ 204,049 $ 226,201
12 months or more, unrealized losses $ (10,937) $ (20,338)
12 months or more, securities 389 440
Total estimated fair value $ 206,323 $ 240,145
Total unrealized losses (11,054) (20,591)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 1,500 3,153
Less than 12 months, unrealized losses $ (7) $ (27)
Less than 12 months, securities 2 4
12 months or more, estimated fair value $ 52,036 $ 56,604
12 months or more, unrealized losses $ (2,622) $ (4,565)
12 months or more, securities 63 74
Total estimated fair value $ 53,536 $ 59,757
Total unrealized losses $ (2,629) $ (4,592)