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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parentheticals) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Consolidated Statements of Stockholders' Equity      
Shares issued in the acquisition of CNB and FNBNY Bancorp (in shares)     5,647,268
Cash dividend declared (in dollars per share) $ 0.92 $ 0.92 $ 0.92
Shares issued in common stock offerings, net of offering costs   1,613,000  
Number of shares issued for trust preferred securities conversions 529,292 10,344