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Note 3 - Investment Securities Available for Sale - Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Under one year, amortized cost | $ 735 |
Under one year, fair value | 734 |
After one year through five years, amortized cost | 6,575 |
After one year through five years, estimated fair value | 6,655 |
After five years through ten years, amortized cost | 19,025 |
After five years through ten years, estimated fair value | 19,069 |
After ten years, amortized cost | 75,751 |
After ten years, estimated fair value | 68,425 |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 508,097 | $ 473,433
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 not due at a single maturity date, amortized cost | 258,397 |
Investment securities not due at a single maturity date, estimated fair value | 250,865 |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 258,397 | 243,709
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 250,865 | 228,391
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member] |  |
Investment securities not due at a single maturity date, amortized cost | 147,614 |
Investment securities not due at a single maturity date, estimated fair value | 138,938 |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 147,614 | 133,749
Debt Securities, Available-for-Sale, Excluding Accrued Interest | $ 138,938 | $ 121,870

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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