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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 28 $ 35
Residential mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 28 35
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value $ 28 $ 35