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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details)
$ in Thousands
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Less than 12 months, estimated fair value $ 14,243 $ 14,624
Less than 12 months, unrealized losses $ (245) $ (204)
Less than 12 months, securities 20 28
12 months or more, estimated fair value $ 663,475 $ 706,936
12 months or more, unrealized losses $ (59,991) $ (62,245)
12 months or more, securities 889 912
Total estimated fair value $ 677,718 $ 721,560
Total unrealized losses (60,236) (62,449)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value 4,518 0
Less than 12 months, unrealized losses $ (28) $ 0
Less than 12 months, securities 2 0
12 months or more, estimated fair value $ 175,289 $ 196,432
12 months or more, unrealized losses $ (12,214) $ (13,587)
12 months or more, securities 108 121
Total estimated fair value $ 179,807 $ 196,432
Total unrealized losses (12,242) (13,587)
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 1,957 1,986
Less than 12 months, unrealized losses $ (2) $ (11)
Less than 12 months, securities 1 2
12 months or more, estimated fair value $ 88,106 $ 90,137
12 months or more, unrealized losses $ (6,500) $ (6,831)
12 months or more, securities 77 78
Total estimated fair value $ 90,063 $ 92,123
Total unrealized losses (6,502) (6,842)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Less than 12 months, estimated fair value 121 467
Less than 12 months, unrealized losses $ (1) $ (12)
Less than 12 months, securities 2 4
12 months or more, estimated fair value $ 93,635 $ 101,265
12 months or more, unrealized losses $ (14,044) $ (14,112)
12 months or more, securities 155 155
Total estimated fair value $ 93,756 $ 101,732
Total unrealized losses (14,045) (14,124)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 4,556 9,054
Less than 12 months, unrealized losses $ (97) $ (73)
Less than 12 months, securities 12 18
12 months or more, estimated fair value $ 241,843 $ 251,286
12 months or more, unrealized losses $ (21,976) $ (22,604)
12 months or more, securities 467 474
Total estimated fair value $ 246,399 $ 260,340
Total unrealized losses (22,073) (22,677)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 3,091 3,117
Less than 12 months, unrealized losses $ (117) $ (108)
Less than 12 months, securities 3 4
12 months or more, estimated fair value $ 64,602 $ 67,816
12 months or more, unrealized losses $ (5,257) $ (5,111)
12 months or more, securities 82 84
Total estimated fair value $ 67,693 $ 70,933
Total unrealized losses $ (5,374) $ (5,219)