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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)

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