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Derivative Instruments and Other Hedging Activities - Reconciliation of Gross Amounts in Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivative assets    
Gross derivative assets $ 8,980 $ 29,056
Gross amounts not offset in the Balance Sheet, derivatives (248) (12,469)
Gross amounts not offset in the Balance Sheet, collateral 0 0
Net derivative assets 8,732 16,587
Derivative liabilities    
Gross derivative liabilities 42,684 16,191
Gross amounts not offset in the Balance Sheet, derivatives (248) (12,469)
Gross amounts not offset in the Balance Sheet, collateral 0 (552)
Net derivative liabilities 42,436 3,170
Written and purchased options    
Derivative assets    
Gross derivative assets 5,267 8,610
Gross amounts not offset in the Balance Sheet, derivatives 0 0
Gross amounts not offset in the Balance Sheet, collateral 0 0
Net derivative assets 5,267 8,610
Derivative liabilities    
Gross derivative liabilities 5,267  
Gross amounts not offset in the Balance Sheet, derivatives 0  
Gross amounts not offset in the Balance Sheet, collateral 0  
Net derivative liabilities 5,267  
Designated as Hedging Instruments | Interest rate contracts    
Derivative assets    
Gross derivative assets 48  
Gross amounts not offset in the Balance Sheet, derivatives 0  
Gross amounts not offset in the Balance Sheet, collateral 0  
Net derivative assets 48  
Derivative liabilities    
Gross derivative liabilities   0
Gross amounts not offset in the Balance Sheet, derivatives   0
Gross amounts not offset in the Balance Sheet, collateral   0
Net derivative liabilities   0
Not Designated as Hedging Instruments | Interest rate contracts    
Derivative assets    
Gross derivative assets 3,665 20,446
Gross amounts not offset in the Balance Sheet, derivatives (248) (12,469)
Gross amounts not offset in the Balance Sheet, collateral 0 0
Net derivative assets 3,417 7,977
Derivative liabilities    
Gross derivative liabilities 37,417 16,191
Gross amounts not offset in the Balance Sheet, derivatives (248) (12,469)
Gross amounts not offset in the Balance Sheet, collateral 0 (552)
Net derivative liabilities $ 37,169 $ 3,170