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Note 4 - Investment Securities (Details Textual) Pure in Thousands, $ in Thousands | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
Proceeds from Sale of Debt Securities, Available-for-Sale |  | $ 277,477 | $ 0 |  |
Debt Securities, Available-for-sale, Holding Greater than 10 Percent of Equity | 0 | 0 |  |  | 0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss | $ 5,500 | $ 5,500 |  |  | $ 2,300
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0 |  | $ 0 | 0
Asset Pledged as Collateral [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Restricted | 792,700 | $ 792,700 |  |  | $ 184,000
First of Long Island Corporation [Member] |  |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-Sale | 277,500 |  |  |  |
Debt Securities, Available-for-Sale, Realized Gain (Loss) | $ 0 |  |  |  |

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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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