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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
	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 21,468	$ 10,636
Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate unpaid principal	168,300
Aggregate carrying value	147,900
Fair value adjustments	1,800
Outstanding balance	146,100
Purchased Credit Impaired | 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
Outstanding balance	$ 128,100

X

- Definition

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

+ References

No definition available.

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- Definition

Transfer Of Portfolio Loans And Leases To Held-For-Sale, Aggregate Unpaid Principal

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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