Description of the business - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended
Jul. 31, 2014
Class Of Stock [Line Items]
Stock issued during period, shares, new issues	3,450
Proceeds from public offering of common stock, net of issuance costs	$ 109,765
Shares Issued, price per share	$ 34.00
Underwriting discounts and commissions and estimated offering expenses	$ 7,534
Stock issued during period shares, overallotment options exercised	450

- 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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