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CONSOLIDATED STATEMENTS OF CONDITION (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
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Statement of Financial Position [Abstract] |  |  |
Securities held to maturity, fair value | $ 47,373 | $ 55,425 | $ 58,566
Allowance for loan losses | $ 14,105 | $ 14,194 | $ 14,488
Preferred stock, par value (in dollars per share) | $ 2.50 | $ 2.50 | $ 2.50
Preferred stock, shares authorized | 20,000,000 | 20,000,000 | 20,000,000
Preferred stock, shares outstanding | 0 | 0 | 0
Common stock, par value (in dollars per share) | $ 2.50 | $ 2.50 | $ 2.50
Common stock, shares authorized | 20,000,000 | 20,000,000 | 20,000,000
Common stock, shares issued | 7,082,245 | 6,126,738 | 6,123,662
Common stock, shares outstanding | 7,019,645 | 6,064,138 | 6,061,062
Treasury stock, shares | 62,600 | 62,600 | 62,600

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