Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) - shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Redemption of preferred stock (in shares)		4,000
Stock options exercised (in shares)	17,333	20,000
Treasury Stock [Member]
Treasury shares issued for compensation (in shares)	24,000	18,322