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Collateralized Securities Transactions (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Collateralized Securities Transactions [Line Items]    
Securities reverse repurchase agreements $ 70,110 $ 129,978
Securities received as collateral under reverse repurchase agreements 73,382 137,829
Securities sold under agreements to repurchase 70,273 134,870
Securities pledged as collateral under repurchase agreements $ 73,382 $ 142,295