Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) - shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Redemption of preferred stock (in shares)		6,651
Stock options exercised (in shares)	21,333	20,000
Treasury Stock [Member]
Treasury shares issued for compensation (in shares)	24,000	19,261