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Note 3 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Less than 12 months, estimated fair value $ 30,256 $ 14,624
Less than 12 months, unrealized losses $ (421) $ (204)
Less than 12 months, securities 38 28
12 months or more, estimated fair value $ 606,162 $ 706,936
12 months or more, unrealized losses $ (51,652) $ (62,245)
12 months or more, securities 832 912
Total estimated fair value $ 636,418 $ 721,560
Total unrealized losses (52,073) (62,449)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value 5,466 0
Less than 12 months, unrealized losses $ (43) $ 0
Less than 12 months, securities 2 0
12 months or more, estimated fair value $ 159,321 $ 196,432
12 months or more, unrealized losses $ (8,733) $ (13,587)
12 months or more, securities 94 121
Total estimated fair value $ 164,787 $ 196,432
Total unrealized losses (8,776) (13,587)
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 3,953 1,986
Less than 12 months, unrealized losses $ (34) $ (11)
Less than 12 months, securities 2 2
12 months or more, estimated fair value $ 77,166 $ 90,137
12 months or more, unrealized losses $ (5,160) $ (6,831)
12 months or more, securities 70 78
Total estimated fair value $ 81,119 $ 92,123
Total unrealized losses (5,194) (6,842)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Less than 12 months, estimated fair value 3,740 467
Less than 12 months, unrealized losses $ (64) $ (12)
Less than 12 months, securities 5 4
12 months or more, estimated fair value $ 86,870 $ 101,265
12 months or more, unrealized losses $ (12,856) $ (14,112)
12 months or more, securities 154 155
Total estimated fair value $ 90,610 $ 101,732
Total unrealized losses (12,920) (14,124)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 13,944 9,054
Less than 12 months, unrealized losses $ (253) $ (73)
Less than 12 months, securities 25 18
12 months or more, estimated fair value $ 226,201 $ 251,286
12 months or more, unrealized losses $ (20,338) $ (22,604)
12 months or more, securities 440 474
Total estimated fair value $ 240,145 $ 260,340
Total unrealized losses (20,591) (22,677)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 3,153 3,117
Less than 12 months, unrealized losses $ (27) $ (108)
Less than 12 months, securities 4 4
12 months or more, estimated fair value $ 56,604 $ 67,816
12 months or more, unrealized losses $ (4,565) $ (5,111)
12 months or more, securities 74 84
Total estimated fair value $ 59,757 $ 70,933
Total unrealized losses $ (4,592) $ (5,219)