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Investment securities pledged (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financial Instruments Owned and Pledged as Collateral [Line Items]
Carrying amount	$ 327,425	$ 613,927
Fair value	$ 334,560	$ 620,922

Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

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