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Derivatives - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Derivatives
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Derivatives
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Risk participation Agreements [Line Items]          
HedgedItemsOfCashFlowHedge $ 200,000   $ 200,000    
Derivative Instruments Designated As Hedging Instruments Interest Income   $ 424      
Derivative, Net Hedge Ineffectiveness Gain (Loss) $ (5) 26      
Risk Participation Agreements Purchased [Domain]          
Risk participation Agreements [Line Items]          
Number of interest rate swaps | Derivatives 28   28    
Risk Participation Agreements Sold [Domain]          
Risk participation Agreements [Line Items]          
Number of interest rate swaps | Derivatives 8   8    
Forward Contracts [Member]          
Risk participation Agreements [Line Items]          
Derivative, Net Hedge Ineffectiveness Gain (Loss) $ (17) 0 $ 95 $ 0  
Derivative Liability, Cost Basis, Gross Asset 9,300   9,300    
Derivative Liability, Fair Value, Gross Asset 9,600   9,600    
Derivative Liability, Notional Amount, Gross Asset 22,200   22,200    
Forward Contracts [Member] | Designated as Hedging Instrument [Member]          
Risk participation Agreements [Line Items]          
Derivative, Fair Value, Net (95)   (95)   $ 0
Derivative, Notional Amount 29,000   29,000   0
Foreign Exchange [Member]          
Risk participation Agreements [Line Items]          
Derivative, Net Hedge Ineffectiveness Gain (Loss) (1) $ 4 1 7  
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]          
Risk participation Agreements [Line Items]          
Derivative, Fair Value, Net 76   76   8
Derivative, Notional Amount 8,239   8,239   4,749
Derivative Liability, Cost Basis, Gross Asset 8,200   8,200   4,700
Derivative Liability, Fair Value, Gross Asset 8,300   8,300   4,700
Three Year Maturity [Member] | Designated as Hedging Instrument [Member]          
Risk participation Agreements [Line Items]          
Derivative, Notional Amount 85,000   85,000    
Four Year Maturity [Member] | Designated as Hedging Instrument [Member]          
Risk participation Agreements [Line Items]          
Derivative, Notional Amount 115,000   115,000    
Interest Rate Swap [Member]          
Risk participation Agreements [Line Items]          
Derivative Instruments Designated As Hedging Instruments Interest Income 136   385 854  
Derivative, Net Hedge Ineffectiveness Gain (Loss)     73 $ 41  
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]          
Risk participation Agreements [Line Items]          
Derivative, Fair Value, Net 139   139   443
Derivative, Notional Amount $ 200,000   $ 200,000   $ 200,000