Consolidated Statements of Shareholder's Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Purchase of treasury stock, shares			23,502
Dividends declared, per common share (in usd per share)	$ 0.49	$ 0.48	$ 0.48