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Repurchase agreement (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Secured debt [Member] Master repurchase agreement [Member]	Mar. 22, 2013 Secured debt [Member] Master repurchase agreement [Member]	May 07, 2013 Secured debt [Member] Master repurchase agreement [Member] Subsequent event [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity				$ 100,000,000
Repurchase agreement	12,926,000	0	12,900,000		79,500,000
Repurchase agreement (from consolidated VIE)Loans pledged as collateral under repurchase agreement			$ 25,400,000

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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