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Note 3 - Securities - Amortized Cost and Fair Value of Securities By Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Due in one year or less, amortized cost | $ 520,347 |
Due in one year or less, fair value | 520,479 |
Due after one year through five years, amortized cost | 13,596 |
Due after one year through five years | 13,582 |
Amortized cost, single maturity date, amortized cost | 533,943 |
Fair value, single maturity date | 534,061 |
Amortized cost | 537,405 | $ 361,290
Fair value | 537,503 | 360,530
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost, without single maturity date, amortized cost | 2,692 |
Fair value, without single maturity date | 2,681 |
Amortized cost | 2,692 | 2,949
Fair value | 2,681 | 2,911
Collateralized Mortgage-Backed Securities [Member] |  |
Amortized cost, without single maturity date, amortized cost | 770 |
Fair value, without single maturity date | 761 |
Amortized cost | 770 | 862
Fair value | $ 761 | $ 850

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year through fifth year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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