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Repurchase agreement (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Secured debt [Member]	Sep. 30, 2013 Secured debt [Member] Repurchase agreement due March 21, 2014	Mar. 22, 2013 Secured debt [Member] Repurchase agreement due March 21, 2014	Sep. 30, 2013 Secured debt [Member] Repurchase agreement due March 23, 2015	Sep. 23, 2013 Secured debt [Member] Repurchase agreement due March 23, 2015	Sep. 30, 2013 Secured debt [Member] Repurchase agreement due March 11, 2016	Sep. 12, 2013 Secured debt [Member] Repurchase agreement due March 11, 2016
Short-term Debt [Line Items]
Maximum borrowing capacity			$ 425,000,000	$ 100,000,000	$ 100,000,000	$ 200,000,000	$ 200,000,000	$ 125,000,000	$ 125,000,000
Interest rate			3.08%
Book value of collateral			566,842,000	165,790,000		270,219,000		130,833,000
Repurchase agreements	$ 338,800,000	$ 0	$ 338,800,000	$ 87,916,000		$ 176,583,000		$ 74,301,000

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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