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Note 5 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details)
$ in Thousands
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Less than 12 months, estimated fair value $ 24,314 $ 30,256
Less than 12 months, unrealized losses $ (256) $ (421)
Less than 12 months, securities 24 38
12 months or more, estimated fair value $ 546,396 $ 606,162
12 months or more, unrealized losses $ (35,327) $ (51,652)
12 months or more, securities 766 832
Total estimated fair value $ 570,710 $ 636,418
Total unrealized losses (35,583) (52,073)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value 3,020 5,466
Less than 12 months, unrealized losses $ (7) $ (43)
Less than 12 months, securities 1 2
12 months or more, estimated fair value $ 126,092 $ 159,321
12 months or more, unrealized losses $ (5,525) $ (8,733)
12 months or more, securities 73 94
Total estimated fair value $ 129,112 $ 164,787
Total unrealized losses (5,532) (8,776)
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 3,066 3,953
Less than 12 months, unrealized losses $ (22) $ (34)
Less than 12 months, securities 1 2
12 months or more, estimated fair value $ 71,156 $ 77,166
12 months or more, unrealized losses $ (3,281) $ (5,160)
12 months or more, securities 64 70
Total estimated fair value $ 74,222 $ 81,119
Total unrealized losses (3,303) (5,194)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Less than 12 months, estimated fair value 7,751 3,740
Less than 12 months, unrealized losses $ (57) $ (64)
Less than 12 months, securities 5 5
12 months or more, estimated fair value $ 82,612 $ 86,870
12 months or more, unrealized losses $ (9,733) $ (12,856)
12 months or more, securities 150 154
Total estimated fair value $ 90,363 $ 90,610
Total unrealized losses (9,790) (12,920)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 9,487 13,944
Less than 12 months, unrealized losses $ (167) $ (253)
Less than 12 months, securities 16 25
12 months or more, estimated fair value $ 212,559 $ 226,201
12 months or more, unrealized losses $ (13,677) $ (20,338)
12 months or more, securities 412 440
Total estimated fair value $ 222,046 $ 240,145
Total unrealized losses (13,844) (20,591)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 990 3,153
Less than 12 months, unrealized losses $ (3) $ (27)
Less than 12 months, securities 1 4
12 months or more, estimated fair value $ 53,977 $ 56,604
12 months or more, unrealized losses $ (3,111) $ (4,565)
12 months or more, securities 67 74
Total estimated fair value $ 54,967 $ 59,757
Total unrealized losses $ (3,114) $ (4,592)