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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Oct. 31, 2020
Dec. 31, 2019
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Nov. 30, 2019
Summary Of Significant Accounting Policies [Line Items]            
Number of shares additional issued 500          
Additional Shares exercised 500          
Assets Held-in-trust     $ 1,300,000,000 $ 1,300,000,000    
Operating lease right-of-use assets     7,907,000 8,782,000    
Operating lease liabilities     8,306,000 9,201,000    
Loans and Leases Receivable, Gross, Total     990,408,000 943,235,000    
Loans Issued Under Coronavirus Aid, Relief, and Economic Security Act [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Loans and Leases Receivable, Gross, Total     $ 0      
Core Deposit Intangibles | Merchants Bancorp            
Summary Of Significant Accounting Policies [Line Items]            
Estimated amortized period of Core Deposit Intangibles     10 years      
Core Deposit Intangibles, gross     $ 1,400,000 1,400,000    
Accumulated amortization     868,000 744,000    
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2023     116,000      
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2024     108,000      
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2025     100,000      
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2026     93,000      
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2027     $ 78,000      
Building and improvements | Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Estimated useful life     45 years      
Furniture and equipment | Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Estimated useful life     3 years      
Furniture and equipment | Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Estimated useful life     20 years      
Leasehold improvements | Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Estimated useful life     15 years      
Leasehold improvements | Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Estimated useful life     25 years      
Trust Company            
Summary Of Significant Accounting Policies [Line Items]            
Number of shares issued   1,500        
Number of stock options exercised   1,500        
Non controlling Interest     $ 212,000 154,000    
Net income attributable to the noncontrolling interest     $ 19,000 $ 10,000 $ 5,000  
Trust Company | Riverview Community Bank            
Summary Of Significant Accounting Policies [Line Items]            
Ownership percentage     97.30%     100.00%
Trust Company | Riverview Trust Company's President And Chief Executive Officer            
Summary Of Significant Accounting Policies [Line Items]            
Noncontrolling interest percentage     2.70%