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Subsequent Events
12 Months Ended
Dec. 31, 2017
Subsequent Events [Abstract]  
SUBSEQUENT EVENTS
NOTE 23—SUBSEQUENT EVENT
Acquisition of brokerage accounts from Capital One
In January 2018, the Company announced an agreement to acquire retail brokerage accounts from Capital One for a purchase price of up to $170 million in cash. The Company intends to fund this transaction with existing corporate cash. The acquisition is expected to close by the third quarter of 2018, subject to customary closing conditions and regulatory approvals.