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INVESTMENT SECURITIES INVESTMENTS - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Gain (Loss) on Securities [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale	$ 290,700	$ 190,000	$ 207,000
Available-for-sale Securities, Gross Realized Gains	500	1,800	1,200
Available-for-sale Securities, Gross Realized Losses	600	200	1,000
Available For Sale Securities Net Realized Gain Loss Tax Provision	0	600	100
Securities transferred from AFS to HTM	372,128	0	0
Proceeds from Sale of Held-to-maturity Securities	0	0	$ 4,862
Pledged Financial Instruments, Not Separately Reported, Securities	$ 1,200,000	$ 800,000
NumberOfSecuritiesInSecurityPortfolio	1,417	775
NumberOfSecuritiesInUnrealizedLossPosition	504	237

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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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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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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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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- 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
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
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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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The cash inflow associated with the sale of securities that had been designated as held-to-maturity. Excludes proceeds from maturities, prepayments and calls by the issuer.

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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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