Subsequent events (Details) (Subsequent event [Member], USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
May 01, 2013	Apr. 05, 2013
Subsequent event [Member]
Subsequent event [Line Items]
Loans acquired, aggregate collateral market value		$ 122.1
Stock issued during period, shares, new issues	17,250,000
Sale of stock, price per share	$ 18.75
Proceeds from issuance of common stock	$ 309.6

Loans Receivable, Acquired in Period, Collateral Market Value

No definition available.

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Balance Type:	debit
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Cash received on stock transaction after deduction of issuance costs.

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section H

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Period Type:	duration

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section H

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Period Type:	duration

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section H

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

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