CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock, par value
Preferred stock, shares authorized	500,000	500,000
Common stock, stated value	$ 0.83	$ 0.83
Common stock, shares authorized	21,000,000	21,000,000
Common stock, shares issued	19,027,812	17,666,173
Treasury stock, shares	408,178	408,178