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Note 2 - Investment Securities - Held to Maturity Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Securities held-to-maturity, carrying value | $ 380,726 | $ 439,837
Securities held-to-maturity, gains | 0 | 1
Securities held-to-maturity, losses | (32,840) | (31,319)
Debt Securities, Held-to-Maturity, Fair Value | 347,886 | 408,519
US Treasury Securities and US Government Agencies Debt Securities [Member] |  |
Securities held-to-maturity, carrying value | 153,536 | 203,259
Securities held-to-maturity, gains | 0 | 0
Securities held-to-maturity, losses | (3,353) | (4,932)
Debt Securities, Held-to-Maturity, Fair Value | 150,183 | 198,327
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities held-to-maturity, carrying value | 26,711 | 26,918
Securities held-to-maturity, gains | 0 | 0
Securities held-to-maturity, losses | (2,637) | (2,457)
Debt Securities, Held-to-Maturity, Fair Value | 24,074 | 24,461
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Securities held-to-maturity, carrying value | 200,479 | 209,660
Securities held-to-maturity, gains | 0 | 1
Securities held-to-maturity, losses | (26,850) | (23,930)
Debt Securities, Held-to-Maturity, Fair Value | $ 173,629 | $ 185,731

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