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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail Textuals)
 12 Months Ended
Mar. 31, 2017
USD ($)
Branch
Segment
Feb. 17, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
Summary Of Significant Accounting Policies [Line Items]        
Percentage of noncontrolling interest held       10.00%
Ownership percentage     100.00% 90.00%
Number of operating segments | Segment 2      
Assets Held-in-trust $ 425,900,000   $ 389,100,000  
Number of branches in rural and suburban communities | Branch 19      
Core Deposit Intangibles        
Summary Of Significant Accounting Policies [Line Items]        
Estimated amortized period of Core Deposit Intangibles 10 years      
Core Deposit Intangibles, gross $ 1,360,000      
Accumulated amortization 27,000      
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2018 232,000      
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2019 183,000      
Estimated amortization expense of Core Deposit Intangibles for fiscal years ended March 31, 2020 160,000      
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, after five year $ 495,000      
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 Three to twenty years      
Leasehold improvements        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful lives Fifteen to twenty-five years      
Estimated Fair Value | Merchants Bancorp        
Summary Of Significant Accounting Policies [Line Items]        
CDI   $ 1,363,000