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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 31, 2019
Mar. 31, 2020
Nov. 30, 2019
Apr. 01, 2019
Mar. 31, 2019
Summary Of Significant Accounting Policies [Line Items]          
Assets Held-in-trust   $ 1,200,000,000     $ 646,000,000
Operating lease liabilities   4,046,000      
Loans and Leases Receivable, Gross, Total   911,509,000     876,116,000
Loans Issued Under Coronavirus Aid, Relief, and Economic Security Act [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Loans and Leases Receivable, Gross, Total   $ 36,200,000      
ASU 2016-02 | Restatement          
Summary Of Significant Accounting Policies [Line Items]          
Operating lease liabilities       $ 5,600,000  
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   604,000     $ 443,000
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2021   140,000      
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, thereafter   $ 170,000      
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      
Riverview Community Bank          
Summary Of Significant Accounting Policies [Line Items]          
Noncontrolling Interest, Ownership Percentage by Parent   98.00% 100.00%    
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   $ 107,000      
Net income attributable to the noncontrolling interest   $ 5,000