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Investments - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Real Estate [Line Items] |  |  |  |
Net realized gains (losses) on investments | $ 56,400 | $ 5,892 | $ 63,352 | $ (12,715)
Realized gains on sales of investment real estate |  | 401 | 0 | 1,213
Proceeds from sales of investment real estate |  | 2,591 | $ 0 | $ 10,537
Real Estate Property |  |  |  |
Real Estate [Line Items] |  |  |  |
Proceeds from sale of premises and equipment |  | 400 |  |
Realized gains on sales of investment real estate |  | 200 |  |
Income Producing |  |  |  |
Real Estate [Line Items] |  |  |  |
Realized gains on sales of investment real estate |  | 2,300 |  |
Proceeds from sales of investment real estate |  | 8,900 |  |
Non-Income Producing |  |  |  |
Real Estate [Line Items] |  |  |  |
Realized gains on sales of investment real estate |  | 400 |  |
Proceeds from sales of investment real estate |  | $ 2,600 |  |

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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