Common Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Jul. 31, 2012	Jul. 23, 2012
Subsidiary, Sale of Stock [Line Items]
Common stock sold	9,775,000
Common Stock (Textual) [Abstract]
Selling price per share		$ 15.40
Gross proceeds raised from the sale of common stock	$ 55.8
Net proceeds from the sale of our common stock	51.9
Underwriting discounts and commissions	2.7
Other offering expenses		$ 1.2
Shares were offered by the Company [Member]
Subsidiary, Sale of Stock [Line Items]
Common stock sold	3,625,000
Shares were offered by selling stockholders [Member]
Subsidiary, Sale of Stock [Line Items]
Common stock sold	6,150,000

- Definition

Fees and commissions from underwriting securities, private placements of securities, investment advisory and management services, merger and acquisition services, and other related consulting fees. Include fees and commissions from securities brokerage activities, from the sale and servicing of mutual funds, from the purchase and sale of securities and money market instruments where the bank is acting as agent for other banks or customers, and from the lending of securities owned by the bank or by bank customers (exclusive of trading revenue). Also includes the bank's proportionate share of the income or loss before extraordinary items and other adjustments from its investments in: unconsolidated subsidiaries, associated companies and corporate joint ventures, unincorporated joint ventures, general partnerships, and limited partnerships over which the bank exercises significant influence and that are principally engaged in investment banking, advisory, brokerage, or securities underwriting activities.

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