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Bank Deposits (Scheduled Maturities of Certificates of Deposit) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Deposits Liabilities Balance Sheet Reported Amounts [Abstract] |  |
Within one year | $ 5,617 | $ 438
One to three years | 544 | 148
Three to five years | 127 |
Certificates of deposit, less than $100 | 6,288 | 586
Within one year | 1,740,855 | 651
One to three years | 193,185 | 338
Three to five years | 29,990 |
Certificates of deposit, $100 and greater | 1,964,030 | 989
Total certificates of deposit | $ 1,970,318 | $ 1,575

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