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Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Interest rate swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative assets $ 5,930 $ 4,723
Fair value, derivative liabilities 5,058 9,825
Designated as Hedging Instrument | Other assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative assets 816 0
Designated as Hedging Instrument | Other assets | Interest rate swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative assets 816 0
Designated as Hedging Instrument | Other liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative liabilities 1,140 3,624
Designated as Hedging Instrument | Other liabilities | Interest rate swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative liabilities 1,140 3,624
Not Designated as Hedging Instrument | Other assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative assets 8,936 10,864
Not Designated as Hedging Instrument | Other assets | Interest rate swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative assets 8,776 10,683
Not Designated as Hedging Instrument | Other assets | Credit contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative assets 100 136
Not Designated as Hedging Instrument | Other assets | Residential mortgage loan commitments    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative assets 60 45
Not Designated as Hedging Instrument | Other liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative liabilities 8,934 10,548
Not Designated as Hedging Instrument | Other liabilities | Interest rate swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative liabilities 8,897 10,537
Not Designated as Hedging Instrument | Other liabilities | Credit contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative liabilities 37 11
Not Designated as Hedging Instrument | Other liabilities | Residential mortgage loan commitments    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative liabilities $ 0 $ 0