Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Changes in Stockholders' Equity [Abstract]
Common dividends declared (in dollars per share)	$ 1.96	$ 1.96	$ 2.11
Preferred dividends declared (in dollars per share)	$ 2.05	$ 0.44