Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statement of Changes in Shareholders' Equity (unaudited) [Abstract]
Redemption of preferred stock (in shares)	18,856
Treasury shares issued for compensation (in shares)	20,302	23,032
Stock options exercised (in shares)	33,666