Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical)

v3.8.0.1
Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash dividends declared:      
Common stock, cash dividend per share (in USD per share) $ 0.35 $ 0.29 $ 0.25
Series A Preferred Stock      
Cash dividends declared:      
Preferred stock dividend per share (in usd per share) 85 85 85
Series B Preferred Stock      
Cash dividends declared:      
Preferred stock dividend per share (in usd per share) 39.11 34.03 $ 29.84
Series C Preferred Stock      
Cash dividends declared:      
Preferred stock dividend per share (in usd per share) 58.76 26.28  
Series D Preferred Stock      
Cash dividends declared:      
Preferred stock dividend per share (in usd per share) $ 62.50 $ 51.04