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Borrowings (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Borrowings $ 618,156,000us-gaap_LongTermDebt $ 383,402,000us-gaap_LongTermDebt
Notes Payable, Other Payables [Member]    
Debt Instrument [Line Items]    
Non-Recourse Debt 3,156,000us-gaap_NonRecourseDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_NotesPayableOtherPayablesMember
3,402,000us-gaap_NonRecourseDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_NotesPayableOtherPayablesMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 6.34%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_NotesPayableOtherPayablesMember
0.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_NotesPayableOtherPayablesMember
Federal Home Loan Bank Advances [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 0.24%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
0.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Line of Credit Facility, Amount Outstanding $ 615,000,000us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_DebtInstrumentAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
$ 380,000,000us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_DebtInstrumentAxis
= us-gaap_FederalHomeLoanBankAdvancesMember