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Note 2 - Business Combination (Details Textual)		1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 01, 2025 USD ($) shares	Jun. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	May 30, 2025 $ / shares	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Share Price (in dollars per share) | $ / shares							$ 22.97
Goodwill		$ 215,611,000	$ 215,611,000		$ 215,611,000				$ 208,372,000
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest		156,190,000	156,190,000	$ 82,077,000	156,190,000	$ 82,077,000		$ 82,403,000	82,685,000	$ 82,869,000	$ 81,974,000
Business Combination, Acquisition-Related Cost, Expense			30,745,000	$ 0	32,065,000	$ 0
Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest		43,332,000	$ 43,332,000		43,332,000				$ 212,000
First of Long Island Corporation [Member]
Business Acquisition, Equity Interest Issued or Issuable, Share Exchange Ratio	0.5175
Business Combination, Consideration Transferred	$ 270,827,680
Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares (in shares) | shares	11,790,116
Goodwill	$ 7,239,000
Deferred Income Tax Expense (Benefit)	(51,100,000)
Business Combination, Pro Forma Information, Net Interest Income of Acquiree since Acquisition Date, Actual		8,500,000
Business Combination, Acquiree's Earnings (Loss) since Acquisition Date, Actual		$ 3,900,000
Business Combination, Acquisition-Related Cost, Expense					$ 32,100,000
First of Long Island Corporation [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	$ 43,300,000

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- Definition

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Amount of expense for acquisition-related cost incurred to effect business combination. Includes, but is not limited to, finder's fee; advisory, legal, accounting, valuation, and other professional and consulting fees; and general administrative cost, including cost of maintaining internal acquisition department.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of acquiree's earnings (loss) since acquisition date of business combination included in consolidated statement of income.

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