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Note 2 - Debt Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Available for sale, amortized cost | $ 1,073,313 | $ 1,207,059
Available for sale, gross unrealized gain | 6,128 | 668
Available for sale, gross unrealized loss | (10,616) | (46,327)
Available for sale, fair value | 1,068,825 | 1,161,400
Held to maturity, amortized cost | 660,076 | 714,853
Held to maturity, gross unrealized gain | 743 | 14
Held to maturity, gross unrealized loss | (44,284) | (75,371)
Held to maturity debt securities, fair value | 616,535 | 639,496
US Treasury Securities [Member] |  |
Available for sale, amortized cost | 520,100 | 617,350
Available for sale, gross unrealized gain | 2,823 | 580
Available for sale, gross unrealized loss | 0 | (444)
Available for sale, fair value | 522,923 | 617,486
Held to maturity, amortized cost | 249,621 | 249,403
Held to maturity, gross unrealized gain | 0 | 0
Held to maturity, gross unrealized loss | (9,589) | (19,632)
Held to maturity debt securities, fair value | 240,032 | 229,771
Collateralized Mortgage-Backed Securities [Member] |  |
Available for sale, amortized cost | 133,126 | 10,516
Available for sale, gross unrealized gain | 1,030 | 1
Available for sale, gross unrealized loss | (852) | (1,000)
Available for sale, fair value | 133,304 | 9,517
Held to maturity, amortized cost | 402,097 | 457,365
Held to maturity, gross unrealized gain | 743 | 14
Held to maturity, gross unrealized loss | (34,395) | (55,150)
Held to maturity debt securities, fair value | 368,445 | 402,229
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale, amortized cost | 10,362 |
Available for sale, gross unrealized gain | 1 |
Available for sale, gross unrealized loss | (554) |
Available for sale, fair value | 9,809 |
Held to maturity, amortized cost | 8,358 | 8,085
Held to maturity, gross unrealized gain | 0 | 0
Held to maturity, gross unrealized loss | (300) | (589)
Held to maturity debt securities, fair value | 8,058 | 7,496
Corporate Debt Securities [Member] |  |
Available for sale, amortized cost | 409,725 | 335,758
Available for sale, gross unrealized gain | 2,274 | 38
Available for sale, gross unrealized loss | (9,210) | (20,673)
Available for sale, fair value | $ 402,789 | 315,123
US Government Agencies Debt Securities [Member] |  |
Available for sale, amortized cost |  | 243,435
Available for sale, gross unrealized gain |  | 49
Available for sale, gross unrealized loss |  | (24,210)
Available for sale, fair value |  | $ 219,274

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