| Goodwill (Tables) | 12 Months Ended | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec. 31, 2020 | |||||||||||||||||||||||||
| Goodwill. | |||||||||||||||||||||||||
| Schedule of changes in the carrying value of goodwill | The changes in the carrying value of goodwill for the year ended December 31, 2020 are as noted in the table below: 
 
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| X | ||||||||||
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- References No definition available. 
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| X | ||||||||||
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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