LOANS AND ALLOWANCE FOR CREDIT LOSSES - FORECLOSURE RECORDED INVESTMENT (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Recorded investment in residential and consumer loans based on payment activity
Loans and Leases Receivable Gross Carrying Amount	$ 4,515,599	$ 4,433,151
Residential Real Estate - Owner Occupied
Recorded investment in residential and consumer loans based on payment activity
Loans and Leases Receivable Gross Carrying Amount	916,526
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	$ 2,425	$ 2,201