LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES - FORECLOSURE RECORDED INVESTMENT (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Recorded investment in residential and consumer loans based on payment activity
Loans and Leases Receivable Gross Carrying Amount	$ 4,014,034	$ 3,810,778
Residential Real Estate - Owner Occupied
Recorded investment in residential and consumer loans based on payment activity
Loans and Leases Receivable Gross Carrying Amount	921,565	1,000,148
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	$ 1,392	$ 1,677