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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Purchase of treasury shares (in shares) 142,405 40,000  
Dividends on common share (in dollars per share) $ 0.84 $ 0.84 $ 0.80
Common Stock [Member]      
Shares issued in acquisition of Empire Bancorp, Inc. (in shares) 2,557,028    
Common shares released from Employee Benefit Trust, shares (in shares) 145,447 154,746 129,601
Restricted stock unit awards vested, shares (in shares) 281,636 297,559 258,567
Exercise of stock options, shares (in shares)   300 900
Treasury Stock [Member]      
Purchase of treasury shares (in shares) 142,405 40,000 787,069
Repurchase of shares to satisfy tax obligation, shares (in shares) 77,611 84,290 76,698