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Derivative Instruments and Other Hedging Activities - Reconciliation of Gross Amounts in Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Derivative assets    
Gross Amounts Presented in the Balance Sheet $ 47,436 $ 24,393
Gross amounts not offset in the Balance Sheet, derivatives 0 0
Gross amounts not offset in the Balance Sheet, collateral 0 0
Net 47,436 24,393
Derivative liabilities    
Gross Amounts Presented in the Balance Sheet 49,212 18,058
Gross amounts not offset in the Balance Sheet, derivatives 0 0
Gross amounts not offset in the Balance Sheet, collateral (57,999) (20,104)
Net (8,787) (2,046)
Written and Purchased Options    
Derivative assets    
Gross Amounts Presented in the Balance Sheet 7,998 6,277
Gross amounts not offset in the Balance Sheet, derivatives 0 0
Gross amounts not offset in the Balance Sheet, collateral 0 0
Net 7,998 6,277
Designated as Hedging Instrument | Interest Rate Contracts    
Derivative assets    
Gross Amounts Presented in the Balance Sheet   58
Gross amounts not offset in the Balance Sheet, derivatives   0
Gross amounts not offset in the Balance Sheet, collateral   0
Net   58
Derivative liabilities    
Gross Amounts Presented in the Balance Sheet 9,649  
Gross amounts not offset in the Balance Sheet, derivatives 0  
Gross amounts not offset in the Balance Sheet, collateral (12,752)  
Net (3,103)  
Not Designated as Hedging Instruments | Interest Rate Contracts    
Derivative assets    
Gross Amounts Presented in the Balance Sheet 39,438 18,058
Gross amounts not offset in the Balance Sheet, derivatives 0 0
Gross amounts not offset in the Balance Sheet, collateral 0 0
Net 39,438 18,058
Derivative liabilities    
Gross Amounts Presented in the Balance Sheet 39,563 18,058
Gross amounts not offset in the Balance Sheet, derivatives 0 0
Gross amounts not offset in the Balance Sheet, collateral (45,247) (20,104)
Net $ (5,684) $ (2,046)