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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			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain on sale of loans	$ 5,735		$ 11,063	$ 10,737	$ 15,405
Total unpaid principal balance of sold PCI loans			98,300		98,300
Total fair value of sold PCI loans			82,400		82,400
Gain on sale of PCI loans			$ 4,400		$ 4,400
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 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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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
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-SubTopic 225
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