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Commitments and contingencies (Detail Textuals) - Jun. 30, 2015 - One-to-four family residences - Re-performing loans - Purchase commitment
$ in Millions
USD ($)
Loan
Mortgage Loans on Real Estate [Line Items]  
Number of mortgage loans on real estate | Loan 158
Aggregate unpaid principal balance of mortgage loans on real estate $ 46.8
Estimated purchase price of mortgage loans on real estate $ 36.0