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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Performance Shares [Member]        
Net shares issued in satisfaction of units earned, shares (in shares)     19,577 24,070
Shares withheld for tax (in shares)     23,754  
Restricted Stock Units (RSUs) [Member] | First of Long Island Corporation [Member]        
Shares withheld for tax (in shares)     22,638  
Restricted Stock Units (RSUs) [Member]        
Net shares issued in satisfaction of units earned, shares (in shares)     42,621  
Shares withheld for tax (in shares)     48,743  
Cash dividend declared on preferred stock, per share (in dollars per share) $ 0.328125 $ 0.328125 $ 0.984375 $ 0.984375
Cash dividends declared on common stock, per share (in dollars per share) $ 0.18 $ 0.18 $ 0.54 $ 0.53
Restricted stock grants, shares (in shares) 1,221 790 71,768 67,672
Net shares issued in satisfaction of units earned, shares (in shares) 3,938 3,938   37,542
Stock grants, shares (in shares)     1,328 1,533
Stock issued in connection with FLIC merger (in shares)     11,790,116  
Repurchase of treasury stock, shares (in shares)       282,370