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Note 2 - Debt Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available for sale, amortized cost | $ 969,090,000 | $ 707,376,000 |
Available for sale, gross unrealized gain | 258,000 | 6,000 |
Available for sale, gross unrealized loss | (69,166,000) | (62,567,000) |
Available for sale, fair value | 900,183,000 | 644,815,000 | [1]
Held to maturity, amortized cost | 982,664,000 | 1,034,121,000 | [1]
Held to maturity, gross unrealized gain | 3,000 | 7,000 |
Held to maturity, gross unrealized loss | (75,475,000) | (98,175,000) |
Held to maturity debt securities, fair value | 907,191,000 | 935,953,000 |
US Treasury Securities [Member] |  |  |
Available for sale, amortized cost | 340,556,000 | 3,002,000 |
Available for sale, gross unrealized gain | 251,000 | 0 |
Available for sale, gross unrealized loss | 0 | (33,000) |
Available for sale, fair value | 340,807,000 | 2,969,000 |
Held to maturity, amortized cost | 508,985,000 | 507,151,000 |
Held to maturity, gross unrealized gain | 0 | 0 |
Held to maturity, gross unrealized loss | (24,718,000) | (36,197,000) |
Held to maturity debt securities, fair value | 484,267,000 | 470,954,000 |
Collateralized Mortgage-Backed Securities [Member] |  |  |
Available for sale, amortized cost | 241,458,000 | 282,480,000 |
Available for sale, gross unrealized gain | 6,000 | 5,000 |
Available for sale, gross unrealized loss | (25,979,000) | (32,782,000) |
Available for sale, fair value | 215,485,000 | 249,703,000 |
Held to maturity, amortized cost | 465,615,000 | 518,929,000 |
Held to maturity, gross unrealized gain | 3,000 | 7,000 |
Held to maturity, gross unrealized loss | (50,025,000) | (60,960,000) |
Held to maturity debt securities, fair value | 415,593,000 | 457,976,000 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Available for sale, amortized cost | 11,400,000 | 15,205,000 |
Available for sale, gross unrealized gain | 1,000 | 1,000 |
Available for sale, gross unrealized loss | (1,178,000) | (1,597,000) |
Available for sale, fair value | 10,223,000 | 13,609,000 |
Held to maturity, amortized cost | 8,063,000 | 8,041,000 |
Held to maturity, gross unrealized gain | 0 | 0 |
Held to maturity, gross unrealized loss | (732,000) | (1,018,000) |
Held to maturity debt securities, fair value | 7,331,000 | 7,023,000 |
Corporate Debt Securities [Member] |  |  |
Available for sale, amortized cost | 375,676,000 | 406,680,000 |
Available for sale, gross unrealized gain | 0 | 0 |
Available for sale, gross unrealized loss | (42,009,000) | (28,155,000) |
Available for sale, fair value | $ 333,667,000 | 378,525,000 |
US Government Agencies Debt Securities [Member] |  |  |
Available for sale, amortized cost |  | 9,000 |
Available for sale, gross unrealized gain |  | 0 |
Available for sale, gross unrealized loss |  | 0 |
Available for sale, fair value |  | $ 9,000 |
[1] | derived from audited financial statements.

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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