Commitments and Contingencies (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Financing receivable impairment	$ 2,700,000		$ 2,700,000		$ 3,000,000
Financing receivable acquired during period	1,900,000	200,000	29,100,000	37,600,000
Financing receivable significant sales	0	0	0	0
[PerformingFinancingReceivableMember]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	33,300,000		33,300,000		46,700,000
[PerformingFinancingReceivableMember] | [ResidentialPrimeFinancingReceivableMember]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	25,500,000		25,500,000		31,300,000
[PerformingFinancingReceivableMember] | [CommercialRealEstateOtherReceivableMember]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	7,800,000		7,800,000		15,400,000
[NonperformingFinancingReceivableMember]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	$ 0		$ 0		$ 0