v3.25.1
JUNIOR SUBORDINATED DEBENTURES - Additional Information (Details)
 12 Months Ended
Mar. 31, 2025
USD ($)
item
Mar. 31, 2024
USD ($)
JUNIOR SUBORDINATED DEBENTURES    
Maximum number of consecutive quarters for deferred payment of each debenture | item 20  
Debentures issued to grantor trusts $ 27,100,000 $ 27,000,000
Common securities issued by grantor trusts $ 836,000 $ 836,000
Riverview Bancorp Statutory Trust I    
JUNIOR SUBORDINATED DEBENTURES    
Description of variable rate three-month Chicago Mercantile Exchange (“CME”) Term Secured Overnight Financing Rate (“SOFR  
Interest basis spread on variable rate 1.36%  
Riverview Bancorp Statutory Trust II    
JUNIOR SUBORDINATED DEBENTURES    
Description of variable rate the three-month CME Term SOFR  
Interest basis spread on variable rate 1.35%  
Merchants Bancorp Statutory Trust I    
JUNIOR SUBORDINATED DEBENTURES    
Description of variable rate three-month CME Term SOFR  
Interest basis spread on variable rate 3.10%