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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Less than 12 months, estimated fair value $ 28,146 $ 30,256
Less than 12 months, unrealized losses $ (329) $ (421)
Less than 12 months, securities 34 38
12 months or more, estimated fair value $ 583,978 $ 606,162
12 months or more, unrealized losses $ (42,365) $ (51,652)
12 months or more, securities 814 832
Total estimated fair value $ 612,124 $ 636,418
Total unrealized losses (42,694) (52,073)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value 3,903 5,466
Less than 12 months, unrealized losses $ (3) $ (43)
Less than 12 months, securities 3 2
12 months or more, estimated fair value $ 143,722 $ 159,321
12 months or more, unrealized losses $ (6,878) $ (8,733)
12 months or more, securities 83 94
Total estimated fair value $ 147,625 $ 164,787
Total unrealized losses (6,881) (8,776)
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 5,391 3,953
Less than 12 months, unrealized losses $ (42) $ (34)
Less than 12 months, securities 4 2
12 months or more, estimated fair value $ 75,426 $ 77,166
12 months or more, unrealized losses $ (4,062) $ (5,160)
12 months or more, securities 67 70
Total estimated fair value $ 80,817 $ 81,119
Total unrealized losses (4,104) (5,194)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Less than 12 months, estimated fair value 2,659 3,740
Less than 12 months, unrealized losses $ (21) $ (64)
Less than 12 months, securities 2 5
12 months or more, estimated fair value $ 85,071 $ 86,870
12 months or more, unrealized losses $ (11,094) $ (12,856)
12 months or more, securities 152 154
Total estimated fair value $ 87,730 $ 90,610
Total unrealized losses (11,115) (12,920)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 13,742 13,944
Less than 12 months, unrealized losses $ (253) $ (253)
Less than 12 months, securities 22 25
12 months or more, estimated fair value $ 223,917 $ 226,201
12 months or more, unrealized losses $ (16,540) $ (20,338)
12 months or more, securities 441 440
Total estimated fair value $ 237,659 $ 240,145
Total unrealized losses (16,793) (20,591)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 2,451 3,153
Less than 12 months, unrealized losses $ (10) $ (27)
Less than 12 months, securities 3 4
12 months or more, estimated fair value $ 55,842 $ 56,604
12 months or more, unrealized losses $ (3,791) $ (4,565)
12 months or more, securities 71 74
Total estimated fair value $ 58,293 $ 59,757
Total unrealized losses $ (3,801) $ (4,592)