Subsequent Events (Details) - USD ($)	May. 09, 2016	Mar. 31, 2016	Dec. 31, 2015
Subsequent Event [Line Items]
Preferred stock, par value (in usd per share)		$ 1	$ 1
Liquidation preference (in usd per share)		$ 10,000	$ 10,000
Subsequent Event | Depository Shares
Subsequent Event [Line Items]
Shares issued	2,300,000
Ownership percentage in preferred stock	0.25%
Liquidation preference equivalent (in usd per share)	$ 25
Liquidation preference	$ 57,500,000
Subsequent Event | Series C Preferred Stock
Subsequent Event [Line Items]
Preferred stock, par value (in usd per share)	$ 1.00
Dividend rate (percentage)	6.60%
Liquidation preference (in usd per share)	$ 10,000
Subsequent Event | Series C Preferred Stock | LIBOR
Subsequent Event [Line Items]
Variable dividend rate beginning on May 1, 2026	492.00%