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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
Mar. 31, 2018
Jan. 01, 2019
OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForSaleOfSecuritiesDisproportionateTaxEffect   $ (190)  
Operating Lease, Right-of-Use Asset $ 59,000   $ 60,200
Operating Lease, Liability 64,609   $ 65,800
Debt Securities, Held-to-maturity, Transfer, Amount 268,700    
Realized gain (loss) on debt securities transferred from HTM to AFS $ 200