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COMMITMENTS, CONTINGENCIES, AND GUARANTEES (Letters of Credit) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Other Commitments [Line Items]    
Lines of credit outstanding $ 122,700 $ 89,600
Letters of credit    
Other Commitments [Line Items]    
Commitments, weighted average term 15 months 3 days  
Letters of credit $ 1,653,301 $ 1,592,726