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Fair value of financial instruments - Fair value by delinquency (details) (Residential portfolio segment [Member], Loans receivable [Member], Residential mortgage [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Residential portfolio segment [Member] | Loans receivable [Member] | Residential mortgage [Member]
 
Fair value  
Current $ 3,662
30 1,613
60 4,377
90 41,988
Foreclosure 36,030
Mortgage loans at fair value 87,670
Unpaid principal balance  
Current 7,851
30 3,871
60 6,586
90 81,713
Foreclosure 73,147
Mortgage loans, unpaid principal balance 173,168
Collateral market value  
Current 6,718
30 2,827
60 6,304
90 64,713
Foreclosure 54,574
Mortgage loans, collateral at fair value $ 135,136