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Note 2 - Investment Securities (Details Textual) $ in Thousands | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Debt Securities, Held-to-Maturity, Number of Securities | 0 |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss | $ 0 |
Debt Securities, Held-to-Maturity, Nonaccrual | 0 | $ 0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss | 5,000 |
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss |  | $ 6,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 514 | 498
Debt Securities, Available-for-Sale, Unrealized Loss Position, Percentage | 99.00% | 98.00%
Collateral Pledged [Member] |  |
Debt Securities, Available-for-Sale, Restricted | $ 839,000 | $ 991,000

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- Definition Amount, after allowance for credit loss, of accrued interest 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 2A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2A Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-3A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-3B + Details
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