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Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets, Fair Value $ 4,175 $ 4,723
Derivative Liabilities, Fair Value 9,307 9,825
Other Assets | Derivative Designated as Cash Flow Hedges | Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets, Fair Value 195 0
Other Assets | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets, Fair Value 10,559 10,864
Other Assets | Not Designated as Hedging Instrument | Residential Mortgage Loan Commitments    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets, Fair Value 102 45
Other Assets | Not Designated as Hedging Instrument | Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets, Fair Value 10,322 10,683
Other Assets | Not Designated as Hedging Instrument | Credit Contract    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets, Fair Value 135 136
Other Liabilities | Derivative Designated as Cash Flow Hedges | Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities, Fair Value 2,586 3,624
Other Liabilities | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities, Fair Value 10,530 10,548
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 10,521 10,537
Other Liabilities | Not Designated as Hedging Instrument | Credit Contract    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities, Fair Value $ 9 $ 11