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Effect of Master Netting Arrangements on Presentation of Derivative Assets and Liabilities in Consolidated Statements of Financial Condition (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Derivative Financial Instruments, Liabilities    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Liabilities $ 5,913 $ 23,728
Gross Amounts Offset in the Statement of Condition 1,702 16,588
Net Amounts of Liabilities Presented in the Statement of Condition 4,211 7,140
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount 4,211 7,140
Derivative Financial Instruments, Assets    
Derivatives, Fair Value [Line Items]    
Gross Amounts Of Recognized Assets 4,779 [1] 20,422 [2]
Gross Amounts Offset in the Statement of Condition 2,402 17,861
Net Amounts of Assets Presented in the Statement of Condition 2,377 2,561
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount $ 2,377 $ 2,561
[1] Includes $1.1 million to purchase Treasury options.
[2] Includes $1.9 million to purchase Treasury options.