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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parentheticals) - $ / shares | 12 Months Ended
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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 |

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