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Deposits - Narrative (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Certificates of deposits denominations in dollar amount | $ 250,000 |
Maximum money market and demand deposit accounts purchasable | 125,000,000.0 |
Outstanding balance of ICS purchases | $ 0 | $ 0
Minimum |  |
Debt Instrument [Line Items] |  |
Certificate of deposits maturities period | 3 months |
Certificate of deposits, fixed interest rates range (as a percent) | 1.30% | 1.00%
Maximum |  |
Debt Instrument [Line Items] |  |
Certificate of deposits maturities period | 5 years |
Certificate of deposits, fixed interest rates range (as a percent) | 3.45% | 2.15%

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