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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			6 Months Ended
	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain on sale of loans	$ 821		$ 983	$ 780	$ 5,002
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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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.

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