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Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease assets	$ 18,247	$ 20,747
Total lease assets	18,247	20,747
Operating lease liabilities	20,058	21,421
Total Lease liabilities	$ 20,058	$ 21,421
Weighted average remaining lease term (years)
Operating leases	8 years	8 years 10 months 24 days
Weighted average discount rate
Operating leases	3.30%	3.40%
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilities

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- Definition

Operating lease assets.

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- Definition

Operating lease liabilities.

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Weighted average discount rate [Abstract]

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Weighted average remaining lease term [Abstract]

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

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- Definition

Indicates line item in statement of financial position that includes operating lease liability.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918631-209977

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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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- Definition

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

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-Publisher FASB
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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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