Commitments and Contingencies (Details) - Jun. 30, 2015	USD ($) lease
Lease Commitments
Number of operating leases | lease	2
Corporate headquarters
Lease Commitments
Irrevocable standby letter of credit provided to landlord	$ 785,000
Corporate headquarters | Low end of range
Lease Commitments
Aggregate annual lease payments	2,400,000
Corporate headquarters | High end of range
Lease Commitments
Aggregate annual lease payments	2,500,000
Off-site back-up facility | Low end of range
Lease Commitments
Aggregate annual lease payments	29,000
Off-site back-up facility | High end of range
Lease Commitments
Aggregate annual lease payments	30,000
Residential whole loan purchase commitments
Residential Whole Loan Purchase Commitments [Abstract]
Obligation to purchase residential whole loans	$ 46,500,000