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Loans and Allowance for Credit Losses on Loans - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) loan	Mar. 31, 2023 USD ($)	Dec. 31, 2023 loan
Loans and Allowance for Credit Losses on Loans
Number of loans modified for borrowers	0
Purchase of loans | $	$ 27,727	$ 98,791
Residential real estate
Loans and Allowance for Credit Losses on Loans
Number of loans in the process of foreclosure	0		0

X

- Definition

Number of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

No definition available.

+ Details

Name:	mbin_FinancingReceivableModifiedInPeriodNumberOfContracts
Namespace Prefix:	mbin_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of financing receivables that are in the process of foreclosure as of the end of the reporting period..

+ References

No definition available.

+ Details

Name:	mbin_MortgageLoansInProcessOfForeclosureNumberOfContracts
Namespace Prefix:	mbin_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash outflow associated with purchasing loans held for investment purposes during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-13

+ Details

Name:	us-gaap_PaymentsToAcquireLoansHeldForInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: