Investments - Commercial Mortgage Loan Participations, Internal Credit Assessment (Details) $ in Thousands	Sep. 30, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan
Financing Receivable, Credit Quality Indicator [Line Items]
Less allowance for credit losses on the investment pool	$ (1,151)	$ (827)
Less allowance for credit losses on individual loans	$ (1,009)	$ 0
Commercial mortgage loan participations
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans \| loan	21	22
Current Fiscal Year	$ 3,000	$ 0
Fiscal Year before Current Fiscal Year	0	25,036
Two Years before Current Fiscal Year	28,376	33,691
Three Years before Current Fiscal Year	32,169	48,214
Four Years before Current Fiscal Year	42,496	35,729
More than Five Years before Current Fiscal Year	36,188
Commercial mortgage loans receivable	142,229	142,670
Carrying value, net of allowance	$ 140,069	$ 141,843
Commercial mortgage loan participations \| Low
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans \| loan	14	14
Current Fiscal Year	$ 3,000	$ 0
Fiscal Year before Current Fiscal Year	0	23,636
Two Years before Current Fiscal Year	27,181	11,925
Three Years before Current Fiscal Year	12,337	41,209
Four Years before Current Fiscal Year	35,462	35,729
More than Five Years before Current Fiscal Year	36,188
Commercial mortgage loans receivable	$ 114,168	$ 112,499
Commercial mortgage loan participations \| Medium
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans \| loan	5	6
Current Fiscal Year	$ 0	$ 0
Fiscal Year before Current Fiscal Year	0	1,400
Two Years before Current Fiscal Year	1,195	17,173
Three Years before Current Fiscal Year	15,722	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	0
Commercial mortgage loans receivable	$ 16,917	$ 18,573
Commercial mortgage loan participations \| High
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans \| loan	2	2
Current Fiscal Year	$ 0	$ 0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	4,593
Three Years before Current Fiscal Year	4,110	7,005
Four Years before Current Fiscal Year	7,034	0
More than Five Years before Current Fiscal Year	0
Commercial mortgage loans receivable	$ 11,144	$ 11,598

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-Publisher FASB
-Name Accounting Standards Codification
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