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Note 4 - Securities - Amortized Cost and Fair Value of Contractual Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Due within one year, amortized cost | $ 566,771 | $ 350,400
Due within one year, fair value | 566,467 | 350,396
Due from one to five years, amortized cost | 116,025 | 70,016
Due from one to five years, fair value | 111,359 | 67,334
Due from five to ten years, amortized cost | 285,159 | 304,216
Due from five to ten years, fair value | 252,915 | 264,893
Due after ten years, amortized cost | 3,000 | 3,000
Due after ten years, fair value | 2,282 | 2,076
Mortgage-backed securities, amortized cost | 268,557 | 241,458
Mortgage-backed securities, fair value | 241,363 | 215,485
Available for sale, amortized cost | 1,239,512 | 969,090
Available for sale, fair value | 1,174,386 | 900,183
Held to maturity debt securities, Due within one year | 25,225 | 260,047
Held to maturity debt securities, Due within one year, fair value | 25,176 | 257,835
Held to maturity debt securities, Due from one to five years | 253,830 | 203,481
Held to maturity debt securities, Due from one to five years, fair value | 229,634 | 185,741
Held to maturity debt securities, Due from five to ten years | 3,289 | 53,521
Held to maturity debt securities, Due from five to ten years, fair value | 2,874 | 48,022
Mortgage-backed securities, amortized cost | 484,911 | 465,615
Mortgage-backed securities, fair value | 426,550 | 415,593
Held to maturity, amortized cost | 767,255 | 982,664
Held to maturity debt securities, fair value | $ 684,234 | $ 907,191

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