Investment Securities (Details 10) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012
AgencyCommercialMortgageBackedSecurities [Member] | Discounted cash flows | AA+
Quantitative information for Level 3 Fair Value Measurements Assets
Fair value Assets	$ 35.3
Prepayment rate (as a percent)	15.00%
Discount Yield (as a percent)	1.20%
Non-agency RMBS | Broker pricing | CCC
Quantitative information for Level 3 Fair Value Measurements Assets
Investments Fair Value Disclosure Difference Due to Broker Valuation Method	1.1
Fair value Assets	14.3
Preferred Stock | Discounted cash flows | NR
Quantitative information for Level 3 Fair Value Measurements Assets
Fair value Assets	$ 70.1
Discount Yield (as a percent)	8.70%