Bank Deposits (Scheduled Maturities of Certificates of Deposit) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deposits Liabilities Balance Sheet Reported Amounts [Abstract]
Within one year	$ 2,222	$ 2,719
One to three years	263	409
Three to five years	54	254
Certificates of deposit, less than $100,000	2,539	3,382
Within one year	35,419	63,650
One to three years	26,874	30,622
Three to five years	100
Certificates of deposit, $100,000 and greater	62,393	94,272
Total certificates of deposit	$ 64,932	$ 97,654