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INVESTMENT SECURITIES, Investment Securities Pledged as Collateral (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities pledged to collateralize certain deposits and borrowings | $ 1,530.0 | $ 1,865.0
U.S. Treasury Securities [Member] | Securities Sold under Agreements to Repurchase [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities pledged to collateralize certain deposits and borrowings | $ 473.2 |

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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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