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Note 4 - Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details) - USD ($) | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available for sale, amortized cost | $ 1,251,951,000 | $ 1,207,059,000 |
Available for sale, gross unrealized gain | 3,628,000 | 668,000 |
Available for sale, gross unrealized loss | (27,728,000) | (46,327,000) |
Available for sale, fair value | 1,227,851,000 | 1,161,400,000 | [1]
Held to maturity, amortized cost | 686,652,000 | 714,853,000 | [1]
Held to maturity, gross unrealized gain | 131,000 | 14,000 |
Held to maturity, gross unrealized loss | (56,678,000) | (75,371,000) |
Held to maturity debt securities, fair value | 630,105,000 | 639,496,000 |
US Treasury Securities [Member] |  |  |
Available for sale, amortized cost | 699,077,000 | 617,350,000 |
Available for sale, gross unrealized gain | 2,442,000 | 580,000 |
Available for sale, gross unrealized loss | (37,000) | (444,000) |
Available for sale, fair value | 701,482,000 | 617,486,000 |
Held to maturity, amortized cost | 249,511,000 | 249,403,000 |
Held to maturity, gross unrealized gain | 0 | 0 |
Held to maturity, gross unrealized loss | (13,349,000) | (19,632,000) |
Held to maturity debt securities, fair value | 236,162,000 | 229,771,000 |
Collateralized Mortgage-Backed Securities [Member] |  |  |
Available for sale, amortized cost | 187,193,000 | 243,435,000 |
Available for sale, gross unrealized gain | 568,000 | 49,000 |
Available for sale, gross unrealized loss | (9,610,000) | (24,210,000) |
Available for sale, fair value | 178,151,000 | 219,274,000 |
Held to maturity, amortized cost | 428,794 | 457,365 |
Held to maturity, gross unrealized gain | 131,000 | 14,000 |
Held to maturity, gross unrealized loss | (42,904,000) | (55,150,000) |
Held to maturity debt securities, fair value | 386,021,000 | 402,229,000 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Available for sale, amortized cost | 10,366,000 | 10,516,000 |
Available for sale, gross unrealized gain | 1,000 | 1,000 |
Available for sale, gross unrealized loss | (728,000) | (1,000,000) |
Available for sale, fair value | 9,639,000 | 9,517,000 |
Held to maturity, amortized cost | 8,347,000 | 8,085,000 |
Held to maturity, gross unrealized gain | 0 | 0 |
Held to maturity, gross unrealized loss | (425,000) | (589,000) |
Held to maturity debt securities, fair value | 7,922,000 | 7,496,000 |
Corporate Debt Securities [Member] |  |  |
Available for sale, amortized cost | 355,315,000 | 335,758,000 |
Available for sale, gross unrealized gain | 617,000 | 38,000 |
Available for sale, gross unrealized loss | (17,353,000) | (20,673,000) |
Available for sale, fair value | $ 338,579,000 | $ 315,123,000 |
[1] | Derived from audited financial statements.

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