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Equity - Capital Purchase Program, Additional Information (Details) - $ / shares shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class of Warrant or Right [Line Items] |  |  |
Warrants outstanding (in shares) | 2.2 | 4.0 |
Warrant exercise price (in USD per share) | $ 8.999 | $ 9.126 | $ 9.264
Warrant |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants exercised (in shares) | 1.8 | 0.4 | 2.8

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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