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Derivatives - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Derivative
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Derivative [Line Items]      
Number of participation agreements for interest rate swaps, participant | Derivative 31    
Number of participation agreements for interest rate swaps, lead bank | Derivative 10    
Derivative, Gain (Loss) on Derivative, Net $ 787 $ (473) $ 219
Interest Rate Swap [Member] | Cash Flow Hedging [Member]      
Derivative [Line Items]      
Derivative, notional amount 65,000    
Collateral Already Posted, Aggregate Fair Value 65,000    
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, notional amount 65,000 150,000  
Interest Rate Swap [Member] | Interest Income [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, Gain (Loss) on Derivative, Net (590) 452 1,627
Interest Rate Swap [Member] | Other Income [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 10 119 70
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, notional amount 1,927 10,077  
Derivative, Underlying Asset Carrying Value 1,900 10,000  
Derivative Liability, Fair Value, Gross Asset 1,900 10,100  
Foreign Exchange Contract [Member] | Other Income [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 15 4 (5)
Forward Contracts [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, notional amount 15,000 17,000  
Derivative, Underlying Asset Carrying Value 6,900 14,300  
Derivative Liability, Fair Value, Gross Asset 7,600 14,700  
Derivative Liability, Notional Amount 9,900 13,800  
Forward Contracts [Member] | Other Income [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ (189) $ (19) $ 0
Four Year [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]      
Derivative [Line Items]      
Derivative, Term of Contract 4 years