Investments - AFS Allowance for Credit Losses (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Expected credit loss on available-for-sale debt securities at beginning of period	$ 489	$ 186
Provision for (or reversal of) credit loss expense	235	303
Expected credit loss on available-for-sale debt securities at end of period	724	489
Corporate Bonds
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Expected credit loss on available-for-sale debt securities at beginning of period	371	148
Provision for (or reversal of) credit loss expense	218	223
Expected credit loss on available-for-sale debt securities at end of period	589	371
Municipal Bonds
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Expected credit loss on available-for-sale debt securities at beginning of period	1	0
Provision for (or reversal of) credit loss expense	(1)	1
Expected credit loss on available-for-sale debt securities at end of period	0	1
Redeemable Preferred Stock
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Expected credit loss on available-for-sale debt securities at beginning of period	117	38
Provision for (or reversal of) credit loss expense	18	79
Expected credit loss on available-for-sale debt securities at end of period	$ 135	$ 117