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Equity Level 4 Capital Purchase Program (Details) - $ / shares shares in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |
Class of Warrant or Right, Outstanding |  | 4.0 | 4.4 |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 9.126 | $ 9.264 | $ 9.388
Warrant [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Warrants Exercised | 25.2 | 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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