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Real Estate Securities and Other Investment Securities (Parenthetical Information Regarding Real Estate Securities) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Real Estate Securities [Member]    
Investment Holdings [Line Items]    
Change in unrealized gain or loss on investments $ (3,000,000)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		  
Other Investment Securities [Member]    
Investment Holdings [Line Items]    
Change in unrealized gain or loss on investments (200,000)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_OtherDebtSecuritiesMember		  
Interest-Only Securities [Member]    
Investment Holdings [Line Items]    
Principal or Notional Balance $ 48,600,000us-gaap_InvestmentOwnedBalancePrincipalAmount
/ us-gaap_DebtSecurityAxis
= us-gaap_InterestOnlyStripMember		 $ 64,300,000us-gaap_InvestmentOwnedBalancePrincipalAmount
/ us-gaap_DebtSecurityAxis
= us-gaap_InterestOnlyStripMember