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STOCKHOLDERS' EQUITY - Summary of Preferred Stock (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
	Feb. 08, 2016	Jun. 30, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Preferred stock, authorized (in shares)		50,000,000
Carrying Value		$ 269,071	$ 269,071
Series E 7.00% non-cumulative perpetual
Class of Stock [Line Items]
Non cumulative preferred stock, dividend rate	7.00%
Preferred Stock
Class of Stock [Line Items]
Preferred stock, authorized (in shares)		280,250	280,250
Preferred stock, shares outstanding (in shares)		280,250	280,250
Liquidation Preference		$ 280,250	$ 280,250
Carrying Value		$ 269,071	$ 269,071
Preferred Stock | Series C 8.00% non-cumulative perpetual
Class of Stock [Line Items]
Preferred stock, authorized (in shares)		40,250	40,250
Preferred stock, shares outstanding (in shares)		40,250	40,250
Non cumulative preferred stock, dividend rate		8.00%	8.00%
Liquidation Preference		$ 40,250	$ 40,250
Carrying Value		$ 37,943	$ 37,943
Preferred Stock | Series D 7.375% non-cumulative perpetual
Class of Stock [Line Items]
Preferred stock, authorized (in shares)		115,000	115,000
Preferred stock, shares outstanding (in shares)		115,000	115,000
Non cumulative preferred stock, dividend rate		7.375%	7.375%
Liquidation Preference		$ 115,000	$ 115,000
Carrying Value		$ 110,873	$ 110,873
Preferred Stock | Series E 7.00% non-cumulative perpetual
Class of Stock [Line Items]
Preferred stock, authorized (in shares)		125,000	125,000
Preferred stock, shares outstanding (in shares)		125,000	125,000
Non cumulative preferred stock, dividend rate		7.00%	7.00%
Liquidation Preference		$ 125,000	$ 125,000
Carrying Value		$ 120,255	$ 120,255

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The percentage rate used to calculate dividend payments on preferred stock.

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Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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