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Repurchase agreement (Details) (USD $)	Jun. 30, 2013	Mar. 22, 2013	Dec. 31, 2012	Jun. 30, 2013 Secured debt [Member] Master repurchase agreement [Member]	Mar. 22, 2013 Secured debt [Member] Master repurchase agreement [Member]	Jul. 18, 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			$ 100,000,000
Repurchase agreement	472,000		0	500,000		500,000
Loans pledged as collateral under repurchase agreement				$ 1,000,000
Line of Credit Facility, Interest Rate at Period End	3.50%

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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