Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical)

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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash dividends declared:      
Common stock, cash dividend per share (in USD per share) $ 0.25 $ 0.21 $ 0.19
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) $ 29.84 $ 29.33 $ 33.14