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Summary of Significant Accounting Policies - Share-Based Compensation (Details) - Restricted Stock - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based compensation
Compensation expense before tax	$ 428,000	$ 312,000	$ 820,000	$ 701,000
Compensation expense after tax	304,000	$ 217,000	592,000	$ 435,000
Unrecognized compensation expense	$ 3,660,000		$ 3,660,000

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

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-Section S99
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