Investment Securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Cost
Equity	$ 315,378	$ 304,305
Debt	799,133	774,580
Other	11,853	19,102
Total	1,126,364	1,097,987
Gains
Equity	121,785	280,127
Debt	298	4,859
Other	66	0
Total	122,149	284,986
Losses
Equity	(8,879)	(4,682)
Debt	(53,665)	(7,001)
Other	(45)	(1)
Total	(62,589)	(11,684)
Fair Value
Equity	428,284	579,750
Debt	745,766	772,438
Other	11,874	19,101
Total	$ 1,185,924	$ 1,371,289