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Note 4 - Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details) - USD ($) | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Available for sale, amortized cost | $ 1,239,919,000 | $ 1,207,059,000
Available for sale, gross unrealized gain | 2,643,000 | 668,000
Available for sale, gross unrealized loss | (38,725,000) | (46,327,000)
Available for sale, fair value | 1,203,837,000 | 1,161,400,000
Held to maturity, amortized cost | 701,713,000 | 714,853,000
Held to maturity, gross unrealized gain | 109,000 | 14,000
Held to maturity, gross unrealized loss | (62,367,000) | (75,371,000)
Held to maturity debt securities, fair value | 639,455,000 | 639,496,000
US Treasury Securities [Member] |  |
Available for sale, amortized cost | 674,821,000 | 617,350,000
Available for sale, gross unrealized gain | 2,244,000 | 580,000
Available for sale, gross unrealized loss | (2,000) | (444,000)
Available for sale, fair value | 677,063,000 | 617,486,000
Held to maturity, amortized cost | 249,457,000 | 249,403,000
Held to maturity, gross unrealized gain | 0 | 0
Held to maturity, gross unrealized loss | (15,765,000) | (19,632,000)
Held to maturity debt securities, fair value | 233,692,000 | 229,771,000
Collateralized Mortgage-Backed Securities [Member] |  |
Available for sale, amortized cost | 232,819,000 | 243,435,000
Available for sale, gross unrealized gain | 398,000 | 49,000
Available for sale, gross unrealized loss | (20,068,000) | (24,210,000)
Available for sale, fair value | 213,149,000 | 219,274,000
Held to maturity, amortized cost | 444,165 | 457,365
Held to maturity, gross unrealized gain | 109,000 | 14,000
Held to maturity, gross unrealized loss | (46,105,000) | (55,150,000)
Held to maturity debt securities, fair value | 398,169,000 | 402,229,000
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale, amortized cost | 10,514,000 | 10,516,000
Available for sale, gross unrealized gain | 1,000 | 1,000
Available for sale, gross unrealized loss | (830,000) | (1,000,000)
Available for sale, fair value | 9,685,000 | 9,517,000
Held to maturity, amortized cost | 8,091,000 | 8,085,000
Held to maturity, gross unrealized gain | 0 | 0
Held to maturity, gross unrealized loss | (497,000) | (589,000)
Held to maturity debt securities, fair value | 7,594,000 | 7,496,000
Corporate Debt Securities [Member] |  |
Available for sale, amortized cost | 321,765,000 | 335,758,000
Available for sale, gross unrealized gain | 0 | 38,000
Available for sale, gross unrealized loss | (17,825,000) | (20,673,000)
Available for sale, fair value | $ 303,940,000 | $ 315,123,000

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