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RECENTLY ADOPTED AND ISSUED ACCOUNTING STANDARDS RECENTLY ADOPTED AND ISSUED ACCOUNTING STANDARDS - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jan. 01, 2019
Income Tax Disclosure [Abstract]        
Operating Lease, Right-of-Use Asset     $ 59,900 $ 60,200
Operating Lease, Liability     $ 65,504 $ 65,800
Debt Securities, Held-to-maturity, Transfer, Amount $ 268,700 $ 367,900    
Realized gain (loss) on debt securities transferred from HTM to AFS $ 200