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Deposits - Narrative (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Banking and Thrift [Abstract] |  |
Required reserve based on the outstanding customer deposits | $ 9,400,000 | $ 11,100,000
Maximum money market and demand deposit accounts purchasable | 125,000,000.0 |
Outstanding balance of ICS purchases | $ 0 | $ 0

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- Definition Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116631393&loc=SL116631396-227033 + Details
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