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Securities and Loan Securities Carried at Fair Value - Additional Information (Detail) (USD $)
 7 Months Ended 12 Months Ended
Jul. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2014
Fair Value Disclosures [Abstract]          
Proceeds from sale of securities carried at fair value $ 75,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 19,918,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities   $ 28,133,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities  
Realized gain (loss) on sale of securities carried at fair value 2,000fur_GainLossOnSaleAndPayoffsOfSecurities 742,000fur_GainLossOnSaleAndPayoffsOfSecurities   655,000fur_GainLossOnSaleAndPayoffsOfSecurities  
Securities sold         0us-gaap_AvailableForSaleSecurities
Net unrealized gains (losses) on securities carried at fair value $ 0us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities $ 73,000us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities $ 73,000us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities $ 7,363,000us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities