Derivatives - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) Derivative	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Derivative [Line Items]
Number of participation agreements for interest rate swaps, participant | Derivative	36
Number of participation agreements for interest rate swaps, lead bank | Derivative	14
Derivative, Gain (Loss) on Derivative, Net	$ (2,521)	$ (269)	$ 787
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	70,000	70,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	70,000	70,000
Interest Rate Swap [Member] | Interest Income [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	(118)	(590)
Interest Rate Swap [Member] | Other Income [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	449	(159)	0
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Asset	2,100	4,800
Derivative, Notional Amount	2,119	4,789
Foreign Exchange Contract [Member] | Other Income [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	18	5	15
Forward Contracts [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Underlying Asset Carrying Value	25,000	9,800
Derivative Liability, Fair Value, Gross Asset	28,400	10,700
Derivative Liability, Notional Amount	47,900	25,500
Derivative, Notional Amount	65,000	30,000
Forward Contracts [Member] | Other Income [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	(189)
Other Income	420	$ 106	$ 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