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Note 4 - Investment Securities (Details Textual) Pure in Thousands, $ in Thousands	1 Months Ended	9 Months Ended
	Jun. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 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
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss		$ 5,200		$ 2,300
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest		0		0
Asset Pledged as Collateral [Member]
Debt Securities, Available-for-Sale, Restricted		$ 834,700		$ 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

X

- Definition

The number of investments in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) that are greater than 10% of equity.

+ References

No definition available.

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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
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount excluding accrued interest, of allowance for credit loss 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 326
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-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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X

- Definition

Amount of realized gain (loss) 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/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
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-Publisher FASB
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- Definition

Amount of restricted 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 860
-SubTopic 30
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-Section 50
-Paragraph 1A
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of cash inflow from sale 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 320
-SubTopic 10
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-Section 45
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