Consolidated Statements of Changes in Shareholders' Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Stockholders' Equity [Abstract]
Common stock dividends (in dollars per share)	$ 0.31	$ 0.31	$ 0.62	$ 0.62