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Bank Deposits (Scheduled Maturities of Certificates of Deposit) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Deposits Liabilities Balance Sheet Reported Amounts [Abstract] |  |
Within one year | $ 250 | $ 2,719
One to three years | 13 | 409
Three to five years |  | 254
Certificates of deposit, less than $100,000 | 263 | 3,382
Within one year | 24,495 | 63,650
One to three years | 10,025 | 30,622
Certificates of deposit, $100,000 and greater | 34,520 | 94,272
Total certificates of deposit | $ 34,783 | $ 97,654

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