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Note 2 - Business Combination (Details Textual) $ / shares in Units, $ in Thousands		3 Months Ended		4 Months Ended	9 Months Ended
	Jun. 01, 2025 USD ($) shares	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	May 30, 2025 $ / shares	Dec. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Share Price (in dollars per share) | $ / shares								$ 22.97
Goodwill		$ 215,611		$ 215,611	$ 215,611				$ 208,372
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest		156,499	$ 82,494	156,499	156,499	$ 82,494	$ 156,190		82,685	$ 82,077	$ 81,974
Business Combination, Acquisition-Related Cost, Expense		1,898	$ 742		33,963	$ 742
Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest		$ 43,336		43,336	43,336				$ 212
First of Long Island Corporation [Member]
Business Acquisition, Equity Interest Issued or Issuable, Share Exchange Ratio	0.5175
Business Combination, Consideration Transferred	$ 270,828
Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares (in shares) | shares	11,790,116
Goodwill	$ 7,239
Deferred Income Tax Expense (Benefit)	(51,100)
Business Combination, Pro Forma Information, Net Interest Income of Acquiree since Acquisition Date, Actual				35,500
Business Combination, Acquiree's Earnings (Loss) since Acquisition Date, Actual				$ 25,600
Business Combination, Acquisition-Related Cost, Expense					$ 34,000
First of Long Island Corporation [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	$ 43,300

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