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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Less than 12 months, estimated fair value $ 18,726 $ 14,624
Less than 12 months, unrealized losses $ (273) $ (204)
Less than 12 months, securities 29 28
12 months or more, estimated fair value $ 689,752 $ 706,936
12 months or more, unrealized losses $ (62,274) $ (62,245)
12 months or more, securities 902 912
Total estimated fair value $ 708,478 $ 721,560
Total unrealized losses (62,547) (62,449)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value 4,491 0
Less than 12 months, unrealized losses $ (19) $ 0
Less than 12 months, securities 2 0
12 months or more, estimated fair value $ 193,044 $ 196,432
12 months or more, unrealized losses $ (13,462) $ (13,587)
12 months or more, securities 118 121
Total estimated fair value $ 197,535 $ 196,432
Total unrealized losses (13,481) (13,587)
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 1,913 1,986
Less than 12 months, unrealized losses $ (18) $ (11)
Less than 12 months, securities 2 2
12 months or more, estimated fair value $ 85,896 $ 90,137
12 months or more, unrealized losses $ (6,843) $ (6,831)
12 months or more, securities 75 78
Total estimated fair value $ 87,809 $ 92,123
Total unrealized losses (6,861) (6,842)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Less than 12 months, estimated fair value 124 467
Less than 12 months, unrealized losses $ (1) $ (12)
Less than 12 months, securities 1 4
12 months or more, estimated fair value $ 97,580 $ 101,265
12 months or more, unrealized losses $ (14,085) $ (14,112)
12 months or more, securities 155 155
Total estimated fair value $ 97,704 $ 101,732
Total unrealized losses (14,086) (14,124)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 9,083 9,054
Less than 12 months, unrealized losses $ (125) $ (73)
Less than 12 months, securities 20 18
12 months or more, estimated fair value $ 247,740 $ 251,286
12 months or more, unrealized losses $ (22,485) $ (22,604)
12 months or more, securities 473 474
Total estimated fair value $ 256,823 $ 260,340
Total unrealized losses (22,610) (22,677)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 3,115 3,117
Less than 12 months, unrealized losses $ (110) $ (108)
Less than 12 months, securities 4 4
12 months or more, estimated fair value $ 65,492 $ 67,816
12 months or more, unrealized losses $ (5,399) $ (5,111)
12 months or more, securities 81 84
Total estimated fair value $ 68,607 $ 70,933
Total unrealized losses $ (5,509) $ (5,219)