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Bank Deposits (Scheduled Maturities of Certificates of Deposit) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deposits Liabilities, Balance Sheet, Reported Amounts [Abstract]    
Within one year $ 11 $ 159
One to three years 5 14
Certificates of deposit, less than $100,000 16 173
Within one year 6,884 20,098
One to three years   6,884
Certificates of deposit, $100,000 and greater 6,884 26,982
Total certificates of deposit $ 6,900 $ 27,155