Regulatory Matters and Significant Risks or Uncertainties - Dividend and Interest Restrictions (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	Oct. 07, 2016	Jun. 30, 2014	Sep. 30, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)			12,205	18,856
Stock Repurchased and Retired During Period, Shares		11,551	6,651
Subsequent Event
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Shares	12,205
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock dividend in arrears			$ 7.1