Fair value of financial instruments - Fair value by delinquency (details) (Loans receivable, Residential mortgage, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015 loan	Dec. 31, 2014 loan
Nonperforming financing receivable \| Residential portfolio segment
Number of loans
Current	794	670
30	95	109
60	41	57
90	2,138	2,286
Foreclosure, number of loan in process	7,021	7,841
Mortgage loans	10,089	10,963
Carrying value
Current	$ 127,984	$ 107,467
30	13,653	15,424
60	6,423	7,921
90	332,892	361,434
Foreclosure, carrying value of loans in process	1,372,543	1,466,798
Mortgage loans	1,853,495	1,959,044
Unpaid principal balance
Current	183,091	159,731
30	20,233	22,629
60	8,986	11,624
90	531,217	569,930
Foreclosure	1,964,595	2,172,047
Mortgage loans	2,708,122	2,935,961
Market value of underlying properties
Current	188,031	160,654
30	20,694	24,046
60	10,288	12,510
90	502,562	544,709
Foreclosure	1,801,433	1,951,606
Mortgage loans	2,523,008	2,693,525
Performing financing receivable
Unpaid principal balance
Mortgage loans	17,520	18,398
Performing financing receivable \| Residential portfolio segment
Number of loans
Current	69	68
30	6	6
60	0	4
90	24	24
Mortgage loans	99	102
Carrying value
Current	8,597	8,317
30	498	1,118
60	0	359
90	3,390	2,741
Mortgage loans	12,485	12,535
Unpaid principal balance
Current	12,004	11,938
30	1,018	1,667
60	0	644
90	4,498	4,149
Market value of underlying properties
Current	15,102	15,154
30	1,074	2,004
60	0	670
90	5,931	4,624
Mortgage loans	$ 22,107	$ 22,452

Financing Receivable, Fair Value of Collateral, 30 to 59 Days Past Due

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- Definition

Financing Receivable, Fair Value of Collateral, 60 to 89 Days Past Due

+ References

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Financing Receivable, Fair Value of Collateral, Current

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Financing Receivable, Fair Value of Collateral, Equal to Greater than 90 Days Past Due

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Financing Receivable, Fair Value of Collateral, Foreclosure

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Financing Receivable, Number of Loans, 30 to 59 Days Past Due

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Financing Receivable, Number of Loans, 60 to 89 Days Past Due

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Financing Receivable, Number of Loans, Equal to Greater Than 90 Days Past Due

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- Definition

Financing Receivable, Number of Loans, Foreclosure

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- Definition

Financing Receivable, Recorded Investment, Foreclosure

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- Definition

Financing Receivables, Number of Loans, Total

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- Definition

Financing Receivable, Unpaid Principal Balance, 30 to 59 Days Past Due

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Financing Receivable, Unpaid Principal Balance, 60 to 89 Days Past Due

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Financing Receivable, Unpaid Principal Balance, Current

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- Definition

Financing Receivable, Unpaid Principal Balance, Equal to Greater than 90 Days Past Due

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- Definition

Financing Receivable, Unpaid Principal Balance, Foreclosure

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- Definition

Financing Recievable, Number of Loans, Current

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- Definition

Loans Receivable, Fair Value of Collateral

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- Definition

Loans Receivable, Unpaid Principal Balance

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- Definition

Financing receivables that are less than 60 days past due but more than 29 days past due.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524

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Financing receivables that are less than 90 days past due but more than 59 days past due.

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Financing receivables that are current.

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- Definition

Financing receivables that are equal to or greater than 90 days past due.

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Glossary Loan

-URI http://asc.fasb.org/extlink&oid=6517073

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