Bank Deposits (Scheduled Maturities of Certificates of Deposit) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Deposits Liabilities Balance Sheet Reported Amounts [Abstract]
Within one year	$ 3,120	$ 5,305
One to three years	244	360
Three to five years	13	13
Certificates of deposit, less than $100,000	3,377	5,678
Within one year	74,158	441,341
One to three years	34,163	68,855
Three to five years	200	7,084
Certificates of deposit, $100,000 and greater	108,521	517,280
Total certificates of deposit	$ 111,898	$ 522,958