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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, 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 $ 1,200,000,000  
Operating lease liabilities     9,201,000    
Loans and Leases Receivable, Gross, Total     943,235,000 911,509,000  
Loans Issued Under Coronavirus Aid, Relief, and Economic Security Act [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Loans and Leases Receivable, Gross, Total     $ 18,100,000    
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     $ 1,360,000 1,360,000  
Accumulated amortization     744,000 604,000  
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2022     125,000    
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, thereafter     $ 77,000    
Building and improvements          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful lives     up to 45 years    
Furniture and equipment          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful lives     3 to 20 years    
Leasehold improvements          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful lives     15 to 25 years, or estimated lease term if shorter    
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     $ 154,000 107,000  
Net income attributable to the noncontrolling interest     $ 10,000 $ 5,000  
Trust Company | Riverview Community Bank          
Summary Of Significant Accounting Policies [Line Items]          
Ownership percentage     97.80%   100.00%