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Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets, Fair Value $ 131 $ 7,529
Derivative Liabilities, Fair Value 58,056 9,077
Other Assets | Derivative Designated as Cash Flow Hedges | Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets, Fair Value 0 256
Other Assets | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets, Fair Value 29,174 14,437
Other Assets | Not Designated as Hedging Instrument | Residential Mortgage Loan Commitments    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets, Fair Value 150 69
Other Assets | Not Designated as Hedging Instrument | Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets, Fair Value 28,718 14,300
Other Assets | Not Designated as Hedging Instrument | Credit Contract    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets, Fair Value 306 68
Other Liabilities | Derivative Designated as Cash Flow Hedges | Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities, Fair Value 27,409 1,502
Other Liabilities | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities, Fair Value 30,907 14,784
Other Liabilities | Not Designated as Hedging Instrument | Residential Mortgage Loan Commitments    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities, Fair Value 0 0
Other Liabilities | Not Designated as Hedging Instrument | Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities, Fair Value 30,778 14,730
Other Liabilities | Not Designated as Hedging Instrument | Credit Contract    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities, Fair Value $ 129 $ 54