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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Purchased Credit Impaired Loans Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain on sale of loans	$ 11,942	$ 35,895	$ 37,211
Total unpaid principal balance of sold PCI loan pools		606,700	52,400
Total fair value of sold PCI loan pools		558,000	32,500
Gain on sale of PCI loan pools		$ 19,200	$ 9,400
PCI Loans | Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate unpaid principal	147,500
Aggregate carrying value	128,400
Fair value adjustments	(274)
Net gain on sale of loans	$ 3,700

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Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Sold

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Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Unpaid Principal Balance, Sold

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Transfer Of Portfolio Loans And Leases To Held-For-Sale, Aggregate Carrying Value

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Amount of other addition (reduction) in allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.3(a))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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