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Offsetting of Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Offsetting Assets and Liabilities [Line Items]    
Repurchase agreements gross and Net Amounts of Liabilities Presented in the Statement of Financial Condition $ 207,676 $ 222,202
Repurchase agreements gross Amounts Not Offset in the Statement of Financial Condition, Financial Instruments 207,676 222,202
Repurchase agreements gross Amounts Not Offset in the Statement of Financial Condition, Cash Collateral Received 0 0
Repurchase agreements Net Amount 0 0
Gross and Net Amounts of Liabilities Presented in the Statement of Financial Condition 261,401 275,046
Gross Amounts Not Offset in the Statement of Financial Condition, Financial Instruments 245,881 258,107
Gross Amounts Not Offset in the Statement of Financial Condition, Cash Collateral Received 11,290 15,377
Net Amount 4,230 1,562
Freestanding Derivatives    
Offsetting Assets and Liabilities [Line Items]    
Derivatives gross and Net Amounts of Assets Presented in the Statement of Financial Condition 40,581 45,416
Derivatives gross Amounts Not Offset in the Statement of Financial Condition, Financial Instruments 38,916 37,788
Derivatives gross Amounts Not Offset in the Statement of Financial Condition, Cash Collateral Received   5,547
Derivatives Net Amount 1,665 2,081
Derivatives gross and Net Amounts of Liabilities Presented in the Statement of Financial Condition 53,725 52,844
Derivatives gross Amounts Not Offset in the Statement of Financial Condition, Financial Instruments 38,205 35,905
Derivatives gross Amounts Not Offset in the Statement of Financial Condition, Cash Collateral Received 11,290 15,377
Derivatives Net Amount $ 4,230 $ 1,562