Fair Value Measurements (Summarize Changes in Level 3 Assets) (Details) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, impairments		$ 0
Securities transferred into or out of level 3, net	$ 1
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	20,590,000	19,546,000
Assets, earnings	(4,594,000)	613,000
Assets, other comprehensive income	0	0
Impairment of Intangible Assets (Excluding Goodwill)	0
Assets, purchases	675,000	2,000,000
Assets, (sales)	0	(1,569,000)
Assets, maturities	0
Assets. transfers out		0
Securities transferred into or out of level 3, net	0
Assets, ending balance	16,671,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value			$ 0	$ 0
Liabilities, earnings	(1,000)	1,000
Liabilities, other comprehensive income	0	0
Liabilities, impairments	0	0
Liabilities, purchases	0	(1,000)
Liabilities, (sales)	0	0
Liabilities, maturities	0	0
Liabilities, transfers out	1,000	0
Level 3 | Debt securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	0	1,000,000
Assets, earnings		0
Assets, other comprehensive income		0
Assets, impairments		0
Assets, purchases		0
Assets, (sales)		(1,000,000)
Assets. transfers out		0
Level 3 | Real estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	20,590,000	18,546,000
Assets, earnings	(4,594,000)	605,000
Assets, other comprehensive income	0	0
Assets, impairments	0	0
Assets, purchases	675,000	2,000,000
Assets, (sales)	0	(561,000)
Assets, maturities		0
Assets. transfers out	0	0
Assets, ending balance	16,671,000
Level 3 | Common stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	9,294,000	9,215,000
Assets, earnings	(4,594,000)	640,000
Assets, other comprehensive income	0	0
Assets, impairments	0	0
Assets, purchases	0	0
Assets, (sales)	0	(561,000)
Assets. transfers out	0	0
Assets, ending balance	4,700,000
Level 3 | Preferred stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	11,296,000	9,331,000
Assets, earnings	0	(35,000)
Assets, other comprehensive income	0	0
Assets, impairments	0	0
Assets, purchases	675,000	2,000,000
Assets, (sales)	0	0
Assets. transfers out	0	0
Assets, ending balance	11,971,000
Level 3 | Arbitrage trading account
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	0	0
Assets, earnings	0	8,000
Assets, other comprehensive income	0	0
Impairment of Intangible Assets (Excluding Goodwill)	0
Assets, impairments		0
Assets, purchases	0	0
Assets, (sales)	0	(8,000)
Assets, maturities	0
Securities transferred into or out of level 3, net	0
Assets, ending balance	0
Level 3 | Corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, beginning balance	$ 0	1,000,000
Assets, earnings		0
Assets, other comprehensive income		0
Impairment of Intangible Assets (Excluding Goodwill)		0
Assets, purchases		0
Assets, (sales)		(1,000,000)
Assets, maturities		0
Securities transferred into or out of level 3, net		$ 0