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Fair Value of Financial Instruments (Carrying Value of Commercial Mortgage Loans and Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total amortized cost | $ 47,570 | $ 47,690
Allowance for mortgage loan losses | (76) | (76)
Mortgage loans, net | 47,494 | 47,614
Total mortgage loans | Mortgage Loans by Region |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 47,570 | $ 47,690
Percent of Total | 100.00% | 100.00%
Total mortgage loans | Mortgage Loans by Region | East North Central |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 3,245 | $ 3,245
Percent of Total | 6.80% | 6.80%
Total mortgage loans | Mortgage Loans by Region | Southern Atlantic |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 9,709 | $ 9,752
Percent of Total | 20.40% | 20.50%
Total mortgage loans | Mortgage Loans by Region | East South Central |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 8,155 | $ 8,197
Percent of Total | 17.10% | 17.20%
Total mortgage loans | Mortgage Loans by Region | New England |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 6,588 | $ 6,588
Percent of Total | 13.80% | 13.80%
Total mortgage loans | Mortgage Loans by Region | Middle Atlantic |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 14,900 | $ 14,936
Percent of Total | 31.40% | 31.20%
Total mortgage loans | Mortgage Loans by Region | Mountain |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 2,227 | $ 2,227
Percent of Total | 4.70% | 4.70%
Total mortgage loans | Mortgage Loans by Region | West North Central |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 2,746 | $ 2,745
Percent of Total | 5.80% | 5.80%
Total mortgage loans | Mortgage Loans by Property Type |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 47,570 | $ 47,690
Percent of Total | 100.00% | 100.00%
Total mortgage loans | Mortgage Loans by Property Type | Multifamily |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 17,025 | $ 17,038
Percent of Total | 35.70% | 35.70%
Total mortgage loans | Mortgage Loans by Property Type | Office |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 11,790 | $ 11,861
Percent of Total | 24.80% | 24.90%
Total mortgage loans | Mortgage Loans by Property Type | Industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 10,124 | $ 10,124
Percent of Total | 21.30% | 21.20%
Total mortgage loans | Mortgage Loans by Property Type | Retail |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 2,227 | $ 2,227
Percent of Total | 4.70% | 4.70%
Total mortgage loans | Mortgage Loans by Property Type | Mixed use/Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 6,404 | $ 6,440
Percent of Total | 13.50% | 13.50%
Less than 65% |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total amortized cost | $ 30,253 | $ 30,361
65%-75% |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total amortized cost | $ 17,317 | $ 17,329

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