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INVESTMENTS - Additional Information (Details) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018
Gain (Loss) on Securities [Line Items]
Realized gain (loss) on debt securities transferred from HTM to AFS		$ 0.2
NumberOfSecuritiesInSecurityPortfolio	1,284				1,284		1,417
NumberOfSecuritiesInUnrealizedLossPosition	119				119		504
Proceeds from Sale of Debt Securities, Available-for-sale	$ 284.9		$ 43.3		$ 400.5	$ 259.5
Available-for-sale Securities, Gross Realized Gains	1.2		0.3		1.9	0.3
Available-for-sale Securities, Gross Realized Losses	$ 1.1		$ 0.4		$ 1.8	$ 0.5
Debt Securities, Held-to-maturity, Transfer, Amount		$ 268.7		$ 367.9

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The total number of securities included in the investment securities portfolio.

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The total number of securities included in the investment securities portfolio that include net accumulated unrealized losses.

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Realized gain (loss) on debt securities transferred from HTM to AFS

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Amount of investment in debt security, measured at amortized cost, transferred to investment in debt security, measured at fair value, with change in fair value recognized in other comprehensive income (available-for-sale) and net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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