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Note 3 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost | $ 700,528 | $ 798,703
Gross unrealized gains | 58 | 135
Gross unrealized losses | (52,073) | (62,449)
Estimated fair value | 648,513 | 736,389
US Treasury Securities [Member] |  |
Amortized cost | 176,483 | 213,646
Gross unrealized gains | 8 | 29
Gross unrealized losses | (8,776) | (13,587)
Estimated fair value | 167,715 | 200,088
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 88,625 | 99,455
Gross unrealized gains | 2 | 2
Gross unrealized losses | (5,194) | (6,842)
Estimated fair value | 83,433 | 92,615
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Amortized cost | 103,964 | 115,988
Gross unrealized gains | 6 | 0
Gross unrealized losses | (12,920) | (14,124)
Estimated fair value | 91,050 | 101,864
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 266,118 | 292,475
Gross unrealized gains | 35 | 93
Gross unrealized losses | (20,591) | (22,677)
Estimated fair value | 245,562 | 269,891
Corporate Debt Securities [Member] |  |
Amortized cost | 65,338 | 77,139
Gross unrealized gains | 7 | 11
Gross unrealized losses | (4,592) | (5,219)
Estimated fair value | $ 60,753 | $ 71,931

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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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