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Note 3 - Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | --- | ---
Amortized cost | $ 437,137 |  | $ 361,290
Gross unrealized gains | 110 |  | 138
Gross unrealized losses | (282) |  | (898)
Fair value | 436,965 |  | 360,530
US States and Political Subdivisions Debt Securities [Member] |  |  |
Amortized cost | 702 |  | 703
Gross unrealized gains | 4 |  | 3
Gross unrealized losses | 0 |  | 0
Fair value | 706 |  | 706
US Treasury Securities [Member] |  |  |
Amortized cost | 432,879 |  | 246,876
Gross unrealized gains | 70 |  | 103
Gross unrealized losses | (216) |  | (689)
Fair value | 432,733 |  | 246,290
Residential Mortgage-Backed Securities [Member] |  |  |
Amortized cost | 2,755 |  | 2,949
Gross unrealized gains | 36 |  | 31
Gross unrealized losses | (55) |  | (69)
Fair value | 2,736 |  | 2,911
Collateralized Mortgage-Backed Securities [Member] |  |  |
Amortized cost | 801 |  | 862
Gross unrealized gains | 0 |  | 0
Gross unrealized losses | (11) |  | (12)
Fair value | $ 790 |  | $ 850
US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Amortized cost |  | $ 109,900 |
Gross unrealized gains |  | 1 |
Gross unrealized losses |  | (128) |
Fair value |  | $ 109,773 |

X
- 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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X
- 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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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of 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 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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- Definition Amount excluding accrued interest, of 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/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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