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INVESTMENT SECURITIES - Amortized cost (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 29 $ 35
Residential mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost [1] 29 35
Gross Unrealized Gains [1] 1 0
Gross Unrealized Losses [1] 0 0
Estimated Fair Value [1] $ 30 $ 35
[1] Comprised of FHLMC and FNMA issued securities.