Derivatives - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Derivatives	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Risk participation Agreements [Line Items]
HedgedItemsOfCashFlowHedge	$ 200,000
Risk Participation Agreements Purchased [Domain]
Risk participation Agreements [Line Items]
Number of interest rate swaps | Derivatives	25
Risk Participation Agreements Sold [Domain]
Risk participation Agreements [Line Items]
Number of interest rate swaps | Derivatives	8
Forward Contracts [Member]
Risk participation Agreements [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	$ 112	$ 0
Derivative Liability, Cost Basis, Gross Asset	5,800
Derivative Liability, Fair Value, Gross Asset	6,000
Derivative Liability, Notional Amount, Gross Asset	15,300
Forward Contracts [Member] | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Fair Value, Net	112		$ 0
Derivative, Notional Amount	17,000		0
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	(38)		8
Derivative, Notional Amount	6,847		4,749
Derivative Liability, Cost Basis, Gross Asset	6,800		4,700
Derivative Liability, Fair Value, Gross Asset	6,800		$ 4,700
Three Year Maturity [Member] | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Notional Amount	85,000
Four Year Maturity [Member] | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Notional Amount	$ 115,000