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Leases - Components of lease costs and supplemental information related to leases (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lease Assets and Liabilities
ROU assets	$ 19,112	$ 18,522
Total lease liabilities	21,164	21,392
Lease Cost
Operating lease expense	6,558	7,274
Total lease expense	6,558	7,274
Other Information
Operating cash outflows from operating leases, net	$ 7,387	$ 8,497
Lease Term and Discount Rate
Weighted average remaining lease term (years)	4 years 1 month 28 days	4 years 2 months 4 days
Weighted average discount rate	2.80%	3.34%

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Amount of lease cost recognized by lessee for lease contract.

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Amount of operating lease expense. Excludes sublease income.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of lessee's right to use underlying asset under operating lease.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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