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Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Interest rate swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative assets $ 7,529 $ 5,930
Fair value, derivative liabilities 9,077 5,058
Designated as Hedging Instrument | Other assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative assets 256 816
Designated as Hedging Instrument | Other assets | Interest rate swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative assets 256 816
Designated as Hedging Instrument | Other liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative liabilities 1,502 1,140
Designated as Hedging Instrument | Other liabilities | Interest rate swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative liabilities 1,502 1,140
Not Designated as Hedging Instrument | Other assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative assets 14,437 8,936
Not Designated as Hedging Instrument | Other assets | Interest rate swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative assets 14,300 8,776
Not Designated as Hedging Instrument | Other assets | Credit contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative assets 68 100
Not Designated as Hedging Instrument | Other assets | Residential mortgage loan commitments    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative assets 69 60
Not Designated as Hedging Instrument | Other liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative liabilities 14,784 8,934
Not Designated as Hedging Instrument | Other liabilities | Interest rate swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative liabilities 14,730 8,897
Not Designated as Hedging Instrument | Other liabilities | Credit contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative liabilities 54 37
Not Designated as Hedging Instrument | Other liabilities | Residential mortgage loan commitments    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value, derivative liabilities $ 0 $ 0