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Bank Deposits (Scheduled Maturities of Certificates of Deposit) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Deposits Liabilities, Balance Sheet, Reported Amounts [Abstract] |  |
Within one year | $ 11 | $ 11
One to three years | 5 | 5
Certificates of deposit, less than $100,000 | 16 | 16
Within one year | 6,884 | 6,884
Certificates of deposit, $100,000 and greater | 6,884 | 6,884
Total certificates of deposit | $ 6,900 | $ 6,900

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