DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Key Data Related to Interest Rate (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 6,566,893	$ 5,628,119
Fair value included in other assets	18,747	30,547
Fair value included in other liabilities	75,041	29,197
Designated as Hedging Instrument [Member] \| Interest rate contracts - designated [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	855,000	705,000
Fair value included in other assets	0	228
Designated as Hedging Instrument [Member] \| Trading Liabilities [Member] \| Interest rate contracts - designated [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value included in other liabilities	4,760	1,982
Not Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	5,349,812	4,490,884
Fair value included in other assets	17,567	28,402
Not Designated as Hedging Instrument [Member] \| Trading Liabilities [Member] \| Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value included in other liabilities	$ 70,153	$ 26,902

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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-SubTopic 20
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No definition available.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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