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INVESTMENT SECURITIES INVESTMENTS - Additional Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Gain (Loss) on Securities [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale			$ 519,100	$ 290,700	$ 190,000
Available-for-sale Securities, Gross Realized Gains			2,100	500	1,800
Available-for-sale Securities, Gross Realized Losses			2,100	600	200
Available For Sale Securities Net Realized Gain Loss Tax Provision			0		600
Securities transferred from HTM to AFS	$ 268,700	$ 372,100	268,703	372,128	$ 0
Realized gain (loss) on debt securities transferred from HTM to AFS	$ 200
Pledged Financial Instruments, Not Separately Reported, Securities			$ 1,100,000	$ 1,200,000
NumberOfSecuritiesInSecurityPortfolio			1,273	1,417
NumberOfSecuritiesInUnrealizedLossPosition			140	504

X

- Definition

Represents the amount of tax provision related to the net realized gains (losses) on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

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- Definition

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

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- Definition

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

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- Definition

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

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- Definition

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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No definition available.

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

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No definition available.

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- Definition

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
-Subparagraph (a)
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Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
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- Definition

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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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