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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Restricted Stock Units (RSUs) [Member] | First of Long Island Corporation [Member]        
Shares withheld for tax (in shares) 22,638   22,638  
Restricted Stock Units (RSUs) [Member]        
Shares withheld for tax (in shares)     44,806  
Net shares issued in satisfaction of units earned, shares (in shares)     38,683  
Performance Shares [Member]        
Shares withheld for tax (in shares)     23,754  
Net shares issued in satisfaction of units earned, shares (in shares)     19,577 24,070
Cash dividend declared on preferred stock, per share (in dollars per share) $ 0.328125 $ 0.328125 $ 0.65625 $ 0.65625
Cash dividends declared on common stock, per share (in dollars per share) $ 0.18 $ 0.18 $ 0.36 $ 0.35
Restricted stock grants, shares (in shares) 32,709 32,016 72,779 68,462
Stock issued in connection with FLIC merger (in shares) 11,790,116   11,790,116  
Stock grants, shares (in shares)     1,328 1,533
Net shares issued in satisfaction of units earned, shares (in shares)       33,604
Repurchase of treasury stock, shares (in shares)       282,370