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INVESTMENT SECURITIES - Summary of Investment Contractual Maturity Dates (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Due within one year, amortized cost $ 96,109 $ 209,319
Due within one year, estimated fair value 96,175 209,266
Die within one year through five years, amortized cost 28,719  
Due within one year through five years, fair value 29,083  
Amortized cost 124,828 209,319
Fair value $ 125,258 $ 209,266