Derivatives - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Derivative	Dec. 31, 2018 USD ($)	Dec. 31, 2017 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	12
Derivative, Gain (Loss) on Derivative, Net	$ (269)	$ 787	$ (473)
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	70,000	65,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	70,000	65,000
Interest Rate Swap [Member] | Interest Income [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(118)	(590)	452
Interest Rate Swap [Member] | Other Income [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(159)	0	0
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	4,789	1,927
Derivative Liability, Fair Value, Gross Asset	4,800	1,900
Foreign Exchange Contract [Member] | Other Income [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	5	15	4
Forward Contracts [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	30,000	15,000
Derivative, Underlying Asset Carrying Value	9,800	6,900
Derivative Liability, Fair Value, Gross Asset	10,700	7,600
Derivative Liability, Notional Amount	25,500	9,900
Forward Contracts [Member] | Other Income [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	(189)	(19)
Other Income	106	$ 0	$ 0
2024 [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	30,000
2026 [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 40,000