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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
Jun. 30, 2013
loan
Residential portfolio segment [Member] | Loans receivable [Member] | Residential mortgage [Member]
 
Number of loans  
Current 102
30 33
60 30
90 460
Foreclosure 707
Mortgage loans, number of loans 1,332
Carrying value  
Current $ 10,748
30 2,793
60 4,299
90 53,905
Foreclosure 91,775
Mortgage loans 163,520
Unpaid principal balance  
Current 22,020
30 6,411
60 8,093
90 106,381
Foreclosure 185,077
Mortgage loans, unpaid principal balance 327,982
Collateral market value  
Current 18,178
30 4,560
60 6,449
90 81,086
Foreclosure 134,500
Mortgage loans, collateral at fair value $ 244,773