LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES - FORECLOSURE RECORDED INVESTMENT (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Recorded investment in residential and consumer loans based on payment activity
Loans and Leases Receivable Gross Carrying Amount	$ 4,136,195	$ 4,014,034
Residential Real Estate - Owner Occupied \| Foreclosure Proceedings In Process
Recorded investment in residential and consumer loans based on payment activity
Loans and Leases Receivable Gross Carrying Amount	$ 4,561	$ 1,392

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant