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Equity Level 4 Capital Purchase Program (Details) - $ / shares
shares in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]        
Class of Warrant or Right, Outstanding   4.0 4.4  
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 9.126 $ 9.264 $ 9.388
Warrant [Member]        
Class of Stock [Line Items]        
Warrants Exercised 25.2 0.4 2.8