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JUNIOR SUBORDINATED DEBENTURES: Terms of the current Debentures (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Debt Instrument [Line Items]    
Amount Outstanding $ 27,836  
Fair value adjustment [1] (1,261)  
Total Debentures $ 26,575 $ 26,484
Riverview Bancorp Statutory Trust I    
Debt Instrument [Line Items]    
Issuance Date 12/2005  
Amount Outstanding $ 7,217  
Rate Type [2] Variable  
Initial Rate 5.88%  
Current Rate 3.97%  
Maturity Date 3/2036  
Riverview Bancorp Statutory Trust II    
Debt Instrument [Line Items]    
Issuance Date 06/2007  
Amount Outstanding $ 15,464  
Rate Type [3] Variable  
Initial Rate 7.03%  
Current Rate 3.96%  
Maturity Date 9/2037  
Merchants Bancorp Statutory Trust I    
Debt Instrument [Line Items]    
Issuance Date [1] 06/2003  
Amount Outstanding [1] $ 5,155  
Rate Type [1],[4] Variable  
Initial Rate [1] 4.16%  
Current Rate [1] 5.71%  
Maturity Date [1] 6/2033  
[1] Amount, net of accretion, attributable to the MBank transaction. See Note 3.
[2] The trust preferred securities reprice quarterly based on the three-month LIBOR plus 1.36%.
[3] The trust preferred securities reprice quarterly based on the three-month LIBOR plus 1.35%.
[4] The trust preferred securities reprice quarterly based on the three-month LIBOR plus 3.10%.