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Derivative Financial Instruments - Fair Value of Derivative Instruments (Detail) - Derivatives Not Designated as Hedging Instruments [Member] - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 16,180 $ 1,938
Other Assets [Member] | Interest Rate Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 16,180 1,938
Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 16,180 1,938
Other Liabilities [Member] | Interest Rate Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ 16,180 $ 1,938