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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 26 $ 28
Residential mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost [1] 26 28
Gross Unrealized Gains [1] 0 0
Gross Unrealized Losses [1] 0 0
Estimated Fair Value [1] $ 26 $ 28
[1] Comprised of FHLMC and FNMA issued securities.