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Effect of Master Netting Arrangements on Presentation of Derivative Assets and Liabilities in Consolidated Statements of Financial Condition (Detail) $ in Thousands | Dec. 31, 2016 USD ($)
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Derivative Financial Instruments, Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities | $ 23,728 |
Gross Amounts Offset in the Statement of Condition | 16,588 |
Net Amounts of Liabilities Presented in the Statement of Condition | 7,140 |
Financial Instruments | 0 |
Cash Collateral Received | 0 |
Net Amount | 7,140 |
Derivative Financial Instruments, Assets |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts Of Recognized Assets | 20,422 | [1]
Gross Amounts Offset in the Statement of Condition | 17,861 |
Net Amounts of Assets Presented in the Statement of Condition | 2,561 |
Financial Instruments | 0 |
Cash Collateral Received | 0 |
Net Amount | $ 2,561 |
[1] | Included $1.9 million to purchase Treasury options.

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