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Note 2 - Business Combination - Schedule of Purchase Price Consideration (Details)
$ / shares in Units, $ in Thousands
Jun. 01, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Goodwill   $ 215,611 $ 208,372
First of Long Island Corporation [Member]      
Exchange Ratio 0.5175    
ConnectOne shares entitlement (in shares) | shares 11,790,116    
Fractional shares subject to cash in lieu $ (383)    
Price per share of ConnectOne common stock on June 1, 2025 (in dollars per share) | $ / shares $ 22.97    
Total fair value of stock consideration issued $ 270,819    
Cash consideration paid 9    
Total purchase price consideration 270,828    
Total purchase price consideration 270,828    
Cash and cash equivalents 54,869    
Securities available-for-sale 596,702    
Premises and equipment, net 45,895    
Pension plan assets 11,617    
Core deposit intangible 63,206    
Other assets 107,480    
Total assets acquired 3,905,094    
Deposits 3,251,147    
Borrowings 360,405    
Other liabilities 29,953    
Total liabilities assumed 3,641,505    
Net assets acquired 263,589    
Goodwill 7,239    
First of Long Island Corporation [Member] | Loans Receivable [Member]      
Financial assets 2,882,951    
First of Long Island Corporation [Member] | Investment in Restricted Stock [Member]      
Financial assets 24,276    
First of Long Island Corporation [Member] | Bank-owned Life Insurance [Member]      
Financial assets $ 118,098    
First of Long Island Corporation [Member] | FLIC Common Stock [Member]      
FLIC common shares settled for stock (in shares) | shares 22,783,572    
First of Long Island Corporation [Member] | ConnectOne Share Entitlement [Member]      
ConnectOne shares entitlement (in shares) | shares 11,790,499