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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Effect of Derivative Instruments on Statement of Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments Gain Loss [Line Items]
Interest Income Loans	$ (139,205)	$ (134,593)	$ (409,918)	$ (398,732)
Mortgage banking activities	4,551	3,117	13,551	11,579
Not Designated as Hedging Instrument, Economic Hedge [Member]
Economic undesignated hedges:
Total gain (loss) on derivatives	211	(35)	108	272
Not Designated as Hedging Instrument, Economic Hedge [Member] | Forward Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Mortgage banking activities	0	0	0	0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Loan Origination Commitments [Member]
Derivative Instruments Gain Loss [Line Items]
Mortgage banking activities	211	34	108	274
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Cap [Member]
Derivative Instruments Gain Loss [Line Items]
Interest Income Loans	$ 0	$ (1)	$ 0	$ (2)

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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Income from mortgage banking activities (fees and commissions) and servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.1)
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

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