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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Purchased Credit Impaired Loans Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net gain on sale of loans			$ 1,932	$ 11,942	$ 35,895
Total unpaid principal balance of sold PCI loan pools	$ 165,700
Total fair value of sold PCI loan pools	144,200
Gain on sale of PCI loan pools	$ 4,700
Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate unpaid principal		$ 168,300
Aggregate carrying value		147,900
PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value adjustments		(274)
Total unpaid principal balance of sold PCI loan pools		147,500
Total fair value of sold PCI loan pools		128,400
PCI Loans | Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate unpaid principal					766,000
Aggregate carrying value					707,400
Net gain on sale of loans		$ (1,800)			$ 24,700

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

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