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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail Textuals 1) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Feb. 17, 2017
Summary Of Significant Accounting Policies [Line Items]
Assets Held-in-trust	$ 646,000,000	$ 484,300,000
Early adoption of ASU 2018-11
Summary Of Significant Accounting Policies [Line Items]
Early adoption of reclassification of tax effects from AOCI to retained earnings	342,000
Early application of ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Increase in other assets and 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
CDI			$ 1,363,000
Core Deposit Intangibles, gross	$ 1,360,000	1,360,000
Accumulated amortization	443,000	$ 260,000
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 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, thereafter	$ 271,000
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
Estimated Fair Value | Merchants Bancorp
Summary Of Significant Accounting Policies [Line Items]
CDI				$ 1,363,000

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