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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Less than 12 months, estimated fair value $ 2,810 $ 14,624
Less than 12 months, unrealized losses $ (14) $ (204)
Less than 12 months, securities 8 28
12 months or more, estimated fair value $ 646,591 $ 706,936
12 months or more, unrealized losses $ (39,821) $ (62,245)
12 months or more, securities 854 912
Total estimated fair value $ 649,401 $ 721,560
Total unrealized losses (39,835) (62,449)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value 0 0
Less than 12 months, unrealized losses $ 0 $ 0
Less than 12 months, securities 0 0
12 months or more, estimated fair value $ 170,184 $ 196,432
12 months or more, unrealized losses $ (7,840) $ (13,587)
12 months or more, securities 102 121
Total estimated fair value $ 170,184 $ 196,432
Total unrealized losses (7,840) (13,587)
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 0 1,986
Less than 12 months, unrealized losses $ 0 $ (11)
Less than 12 months, securities 0 2
12 months or more, estimated fair value $ 85,317 $ 90,137
12 months or more, unrealized losses $ (4,064) $ (6,831)
12 months or more, securities 73 78
Total estimated fair value $ 85,317 $ 92,123
Total unrealized losses (4,064) (6,842)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Less than 12 months, estimated fair value 0 467
Less than 12 months, unrealized losses $ 0 $ (12)
Less than 12 months, securities 0 4
12 months or more, estimated fair value $ 93,339 $ 101,265
12 months or more, unrealized losses $ (10,142) $ (14,112)
12 months or more, securities 154 155
Total estimated fair value $ 93,339 $ 101,732
Total unrealized losses (10,142) (14,124)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 2,810 9,054
Less than 12 months, unrealized losses $ (14) $ (73)
Less than 12 months, securities 8 18
12 months or more, estimated fair value $ 236,197 $ 251,286
12 months or more, unrealized losses $ (14,456) $ (22,604)
12 months or more, securities 447 474
Total estimated fair value $ 239,007 $ 260,340
Total unrealized losses (14,470) (22,677)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 0 3,117
Less than 12 months, unrealized losses $ 0 $ (108)
Less than 12 months, securities 0 4
12 months or more, estimated fair value $ 61,554 $ 67,816
12 months or more, unrealized losses $ (3,319) $ (5,111)
12 months or more, securities 78 84
Total estimated fair value $ 61,554 $ 70,933
Total unrealized losses $ (3,319) $ (5,219)