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Commercial Mortgage Residual Interests (Schedule of Amounts Recognized as Unrealized Gains and/or Losses Recorded as Other Comprehensive Income and Other Than Temporary Valuation Impairments Recorded in Earnings) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commercial Mortgage Residual Interests [Abstract]      
Unrealized gains $ 875nnn_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnResidualInterestOfSecuritizationArisingDuringPeriodNetOfTax $ 511nnn_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnResidualInterestOfSecuritizationArisingDuringPeriodNetOfTax $ 1,132nnn_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnResidualInterestOfSecuritizationArisingDuringPeriodNetOfTax
Other than temporary valuation impairment $ 256us-gaap_ImpairmentOfRetainedInterest $ 1,185us-gaap_ImpairmentOfRetainedInterest $ 2,812us-gaap_ImpairmentOfRetainedInterest