JUNIOR SUBORDINATED DEBENTURES - (Details) - USD ($) $ in Thousands		9 Months Ended
		Dec. 31, 2019	Mar. 31, 2019
Debt Instrument [Line Items]
Amount Outstanding		$ 27,836
Fair value adjustment		(1,196)
Total Debentures		$ 26,640	$ 26,575
Riverview Bancorp Statutory Trust I
Debt Instrument [Line Items]
Issuance Date		12/2005
Amount Outstanding		$ 7,217
Rate Type	[1]	Variable
Initial Rate		5.88%
Current Rate		3.25%
Maturity Date		3/2036
Riverview Bancorp Statutory Trust II
Debt Instrument [Line Items]
Issuance Date		06/2007
Amount Outstanding		$ 15,464
Rate Type	[2]	Variable
Initial Rate		7.03%
Current Rate		3.24%
Maturity Date		9/2037
Merchants Bancorp Statutory Trust I
Debt Instrument [Line Items]
Issuance Date		06/2003
Amount Outstanding		$ 5,155
Rate Type	[3]	Variable
Initial Rate		4.16%
Current Rate		5.05%
Maturity Date		6/2033

[1] The trust preferred securities reprice quarterly based on the three-month LIBOR plus 1.36%.

[2] The trust preferred securities reprice quarterly based on the three-month LIBOR plus 1.35%.

[3] The trust preferred securities reprice quarterly based on the three-month LIBOR plus 3.10%.