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Note 4 - Investment Securities - Summary of Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Held-to-maturity securities (fair value of $193,973 in 2024; $197,176 in 2023) | $ 224,612 | $ 224,233
Held to maturity securities, gross unrealized gains | 0 | 0
Held to maturity securities, gross unrealized losses | (30,639) | (27,057)
Held to maturity securities, fair value | 193,973 | 197,176
Available for sale securities, amortized cost | 388,415 | 395,635
Available for sale debt securities, gross unrealized gains | 0 | 1
Available for sale securities, gross unrealized losses | (54,011) | (51,596)
Available for sale debt security, fair value | 334,404 | 344,040
US Government Agencies Debt Securities [Member] |  |
Held-to-maturity securities (fair value of $193,973 in 2024; $197,176 in 2023) | 81,656 | 81,382
Held to maturity securities, gross unrealized gains | 0 | 0
Held to maturity securities, gross unrealized losses | (8,682) | (7,561)
Held to maturity securities, fair value | 72,974 | 73,821
Available for sale securities, amortized cost | 31,201 | 31,178
Available for sale debt securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | (3,770) | (3,633)
Available for sale debt security, fair value | 27,431 | 27,545
US States and Political Subdivisions Debt Securities [Member] |  |
Held-to-maturity securities (fair value of $193,973 in 2024; $197,176 in 2023) | 142,956 | 142,851
Held to maturity securities, gross unrealized gains | 0 | 0
Held to maturity securities, gross unrealized losses | (21,957) | (19,496)
Held to maturity securities, fair value | 120,999 | 123,355
Available for sale securities, amortized cost | 137,025 | 138,217
Available for sale debt securities, gross unrealized gains | 0 | 1
Available for sale securities, gross unrealized losses | (15,953) | (15,421)
Available for sale debt security, fair value | 121,072 | 122,797
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Available for sale securities, amortized cost | 220,189 | 226,240
Available for sale debt securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | (34,288) | (32,542)
Available for sale debt security, fair value | $ 185,901 | $ 193,698

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