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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 12 Months Ended
Mar. 31, 2019
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Recently Adopted and Issued Accounting Standards [Abstract]            
Operating Lease, Right-of-Use Asset     $ 58,600 $ 0 $ 0 $ 60,249
Operating Lease, Liability           $ 65,800
Securities transferred from HTM to AFS $ 268,700 $ 372,100 268,703 $ 372,128 $ 0  
Realized gain (loss) on debt securities transferred from HTM to AFS $ 200          
Allowance for loans and leases losses, range of increase, minimum     115,000      
Allowance for loans and leases losses, increase, maximum     125,000      
Reserve for unfunded commitments, dollar range of increase, minimum     11,000      
Reserve for unfunded commitments, dollar range of increase, maximum     $ 14,000