Bank Deposits (Scheduled Maturities of Certificates of Deposit) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
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