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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Purchase Credit Impaired Loans Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain (loss) on sale of loans	$ (41)			$ 4,019
Consumer | Single family residential mortgage | Purchased Credit Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate unpaid principal			$ 147,500
Aggregate carrying value			128,400
Fair value adjustments			$ 274
Net gain (loss) on sale of loans		$ 3,700

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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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))
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