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Note 5 - Derivatives - Schedule of Fair Value Hedges Cumulative-basis Adjustment (Details) - Designated as Hedging Instrument [Member] - Fair Value Hedging [Member] - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Cumulative Amount of Fair Value Hedging Adjustment |  | $ 2,118 | $ 4,299
Securities Investment [Member] |  |  |
Cumulative Amount of Fair Value Hedging Adjustment | [1] | 2,118 | 4,299
Reported Value Measurement [Member] |  |  |
Hedged Assets |  | 57,882 | 55,701
Reported Value Measurement [Member] | Securities Investment [Member] |  |  |
Hedged Assets | [1] | $ 57,882 | $ 55,701
[1] | These amounts include the amortized cost basis of closed portfolios used in designated hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. At September 30, 2025, the amortized cost basis of the closed portfolios used in these hedging relationships was $183.2 million; the cumulative basis adjustments associated with these hedging relationships was $2.1 million; and the amount of the designated hedged items was $60.0 million. At December 31, 2024, the amortized cost basis of the closed portfolios used in these hedging relationships was $189.0 million; the cumulative basis adjustment associated with these hedging relationships was $4.3 million; and the amount of the designated hedged items was $60.0 million.

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- Definition Amount of asset hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-181 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, in portfolio layer hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-181 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EEE -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EEE + Details
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