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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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- References

No definition available.

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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

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- Definition

Maximum Money Market And Demand Deposit Accounts Purchasable

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- Definition

Money Market And Demand Deposit Accounts, Insured Cash Sweep

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