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Note 6 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized cost | $ 682,940 | $ 700,528
Gross unrealized gains | 170 | 58
Gross unrealized losses | (42,694) | (52,073)
Estimated fair value | 640,416 | 648,513
US Treasury Securities [Member] |  |
Amortized cost | 165,789 | 176,483
Gross unrealized gains | 55 | 8
Gross unrealized losses | (6,881) | (8,776)
Estimated fair value | 158,963 | 167,715
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 90,704 | 88,625
Gross unrealized gains | 24 | 2
Gross unrealized losses | (4,104) | (5,194)
Estimated fair value | 86,624 | 83,433
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Amortized cost | 100,340 | 103,964
Gross unrealized gains | 15 | 6
Gross unrealized losses | (11,115) | (12,920)
Estimated fair value | 89,240 | 91,050
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 262,297 | 266,118
Gross unrealized gains | 57 | 35
Gross unrealized losses | (16,793) | (20,591)
Estimated fair value | 245,561 | 245,562
Corporate Debt Securities [Member] |  |
Amortized cost | 63,810 | 65,338
Gross unrealized gains | 19 | 7
Gross unrealized losses | (3,801) | (4,592)
Estimated fair value | $ 60,028 | $ 60,753

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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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