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Note 3 - Investment Securities Available for Sale - Amortized Cost and Estimated Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Investment securities available for sale, amortized cost | $ 508,097 | $ 473,433
Investment securities available for sale, gross unrealized gains | 4,155 | 530
Investment securities available for sale, gross unrealized losses | (27,566) | (36,228)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 484,686 | 437,735
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member] |  |
Investment securities available for sale, amortized cost | 258,397 | 243,709
Investment securities available for sale, gross unrealized gains | 2,216 | 138
Investment securities available for sale, gross unrealized losses | (9,748) | (15,456)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 250,865 | 228,391
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member] |  |
Investment securities available for sale, amortized cost | 147,614 | 133,749
Investment securities available for sale, gross unrealized gains | 1,253 | 77
Investment securities available for sale, gross unrealized losses | (9,929) | (11,956)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 138,938 | 121,870
US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 102,086 | 95,975
Investment securities available for sale, gross unrealized gains | 686 | 315
Investment securities available for sale, gross unrealized losses | (7,889) | (8,816)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | $ 94,883 | $ 87,474

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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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- 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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