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Acquisition of Westminster American Insurance Company (Narrative) (Details) - Westminster [Member] $ in Thousands | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 02, 2020 | Sep. 30, 2021 USD ($) Number | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |
Ownership percentage in acquisition | 100.00% |  |  |
Acquisition related costs incurred |  |  | $ 828 | $ 83
Additional acquisition of entity |  | $ 20 |  |
Number of installments | Number |  | 3 |  |
Useful life of other intangible assets |  | 20 years |  |

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