Investment Securities (Significant Unobservable Inputs) (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
NR | Preferred Stock | Discounted cash flows
Quantitative information for Level 3 Fair Value Measurements Assets
Fair value Assets	$ 71,500,000	$ 71,000,000
NR | Preferred Stock | Discount Yield [Member]
Quantitative information for Level 3 Fair Value Measurements Assets
Discount Yield (as a percent)	6.60%	7.40%
NR | Non-Agency Residential Mortgage Resecuritization | Broker Pricing
Quantitative information for Level 3 Fair Value Measurements Assets
Fair value Assets	8,600,000
NR | Private equity funds | Multiple of GAAP book value
Quantitative information for Level 3 Fair Value Measurements Assets
Fair value Assets	37,400,000	35,600,000
Book value multiple (as a percent)	100.00%	100.00%
NR | Private equity funds | Average Share Price [Member]
Quantitative information for Level 3 Fair Value Measurements Assets
Average Share Price Used As Unobservable Input	1.10	1.10
NR | Private equity funds | Recent transaction [Member]
Quantitative information for Level 3 Fair Value Measurements Assets
Fair value Assets	15,700,000	10,500,000
NR | Convertible Preferred Stock [Member] | Multiple of EBITA [Member]
Quantitative information for Level 3 Fair Value Measurements Assets
Unobservable Inputs	6.0
NR | Convertible Preferred Stock [Member] | Recent transaction [Member]
Quantitative information for Level 3 Fair Value Measurements Assets
Fair value Assets	4,500,000	6,100,000
Average Share Price Used As Unobservable Input	0.71
Share Price of Recent Transaction Used As Unobservable Input		6.1
AA | Mortgage-backed and asset-backed securities | Broker Pricing
Quantitative information for Level 3 Fair Value Measurements Assets
Fair value Assets	22,000,000	22,000,000
AAA | Non-Agency Residential Mortgage Resecuritization | Broker Pricing
Quantitative information for Level 3 Fair Value Measurements Assets
Fair value Assets	45,300,000
AAA | Non-Agency Commercial Mortgage Backed Securities [Member] [Member] | Broker Indication [Member]
Quantitative information for Level 3 Fair Value Measurements Assets
Fair value Assets	11,100,000
Fair value input, swap spread rate	1.20%
AAA | Convertible Preferred Stock [Member] | Multiple of EBITA [Member]
Quantitative information for Level 3 Fair Value Measurements Assets
Fair value Assets	$ 6,300,000