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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, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Total amortized cost $ 45,192 $ 42,520
Allowance for mortgage loan losses (77) (72)
Mortgage loans 45,115 42,448
Total mortgage loans | Mortgage Loans by Region    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans $ 45,192 $ 42,520
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 $ 3,245 $ 3,245
Percent of Total 7.20% 7.60%
Total mortgage loans | Mortgage Loans by Region | Southern Atlantic    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans $ 7,026 $ 7,026
Percent of Total 15.50% 16.50%
Total mortgage loans | Mortgage Loans by Region | East South Central    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans $ 8,318 $ 8,358
Percent of Total 18.40% 19.70%
Total mortgage loans | Mortgage Loans by Region | New England    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans $ 6,588 $ 6,588
Percent of Total 14.60% 15.50%
Total mortgage loans | Mortgage Loans by Region | Middle Atlantic    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans $ 15,042 $ 15,076
Percent of Total 33.30% 35.50%
Total mortgage loans | Mortgage Loans by Region | Mountain    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans $ 2,227 $ 2,227
Percent of Total 4.90% 5.20%
Total mortgage loans | Mortgage Loans by Region | West North Central    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans $ 2,746 $ 0
Percent of Total 6.10% 0.00%
Total mortgage loans | Property Type Concentration Risk    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans $ 45,192 $ 42,520
Percent of Total 100.00% 100.00%
Total mortgage loans | Property Type Concentration Risk | Multifamily    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans $ 14,487 $ 11,741
Percent of Total 32.10% 27.60%
Total mortgage loans | Property Type Concentration Risk | Office    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans $ 11,808 $ 11,848
Percent of Total 26.10% 27.90%
Total mortgage loans | Property Type Concentration Risk | Industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans $ 10,124 $ 10,124
Percent of Total 22.40% 23.80%
Total mortgage loans | Property Type Concentration Risk | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans $ 2,227 $ 2,227
Percent of Total 4.90% 5.20%
Total mortgage loans | Property Type Concentration Risk | Mixed use/Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans $ 6,546 $ 6,580
Percent of Total 14.50% 15.50%
Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total amortized cost $ 36,696 $ 34,024
65%-75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total amortized cost $ 8,496 $ 8,496