Investments In Securities and Fair Value (Schedule of Variable Interest Entities) (Details) - Other investments $ in Thousands	Jun. 30, 2023 USD ($)
Variable Interest Entity, Not Primary Beneficiary [Line Items]
Carrying Value	$ 13,263
Estimated Fair Value	13,783
Maximum Potential Loss (a)	18,738
Real Estate LLCs or LPs
Variable Interest Entity, Not Primary Beneficiary [Line Items]
Carrying Value	4,425
Estimated Fair Value	4,720
Maximum Potential Loss (a)	5,658
Small Business Investment LPs
Variable Interest Entity, Not Primary Beneficiary [Line Items]
Carrying Value	8,838
Estimated Fair Value	9,063
Maximum Potential Loss (a)	$ 13,080