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Derivatives - Additional Information (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Derivatives
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Risk Participation Agreements Purchased [Domain]      
Risk participation Agreements [Line Items]      
Number of interest rate swaps | Derivatives 31    
Risk Participation Agreements Sold [Domain]      
Risk participation Agreements [Line Items]      
Number of interest rate swaps | Derivatives 9    
Forward Contracts [Member]      
Risk participation Agreements [Line Items]      
Derivative, Net Hedge Ineffectiveness Gain (Loss) $ (64) $ (62)  
Derivative Liability, Cost Basis, Gross Asset 7,200   $ 6,900
Derivative Liability, Fair Value, Gross Asset 8,200   7,600
Derivative Liability, Notional Amount, Gross Asset 25,200   9,900
Forward Contracts [Member] | Designated as Hedging Instrument [Member]      
Risk participation Agreements [Line Items]      
Derivative, Fair Value, Net 234   170
Derivative, Notional Amount 30,000   15,000
Foreign Exchange [Member]      
Risk participation Agreements [Line Items]      
Derivative, Net Hedge Ineffectiveness Gain (Loss) 2 (3)  
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]      
Risk participation Agreements [Line Items]      
Derivative, Fair Value, Net (7)   6
Derivative, Notional Amount 1,797   1,927
Derivative Liability, Cost Basis, Gross Asset 1,800   1,900
Derivative Liability, Fair Value, Gross Asset 1,800   1,900
Interest Rate Swap [Member]      
Risk participation Agreements [Line Items]      
Derivative Instruments Designated As Hedging Instruments Interest Income (118) (81)  
Derivative, Net Hedge Ineffectiveness Gain (Loss) 7 $ 0  
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]      
Risk participation Agreements [Line Items]      
Derivative, Fair Value, Net 0   133
Derivative, Notional Amount $ 0   $ 65,000