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Note 2 - Investment Securities - Held to Maturity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Securities held-to-maturity, carrying value | $ 374,912 | $ 439,837
Securities held-to-maturity, gains | 3 | 1
Securities held-to-maturity, losses | (22,485) | (31,319)
Debt Securities, Held-to-Maturity, Fair Value | 352,430 | 408,519
US Treasury Securities and US Government Agencies Debt Securities [Member] |  |
Securities held-to-maturity, carrying value | 153,692 | 203,259
Securities held-to-maturity, gains | 0 | 0
Securities held-to-maturity, losses | (1,539) | (4,932)
Debt Securities, Held-to-Maturity, Fair Value | 152,153 | 198,327
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities held-to-maturity, carrying value | 25,726 | 26,918
Securities held-to-maturity, gains | 0 | 0
Securities held-to-maturity, losses | (1,478) | (2,457)
Debt Securities, Held-to-Maturity, Fair Value | 24,248 | 24,461
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Securities held-to-maturity, carrying value | 195,494 | 209,660
Securities held-to-maturity, gains | 3 | 1
Securities held-to-maturity, losses | (19,468) | (23,930)
Debt Securities, Held-to-Maturity, Fair Value | $ 176,029 | $ 185,731

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