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Nature of Operations and Summary of Significant Accounting Policies - Loans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	May 05, 2022
Loans and Allowance for Credit Losses on Loans
Accrued interest on loans, excluded from amortized cost of loans	$ 60.4	$ 35.0
Initial ACL - Guarantee	$ 1.2
Loan Sale and Freddie Mac Q Series Securitization
Loans and Allowance for Credit Losses on Loans
First loss position in loan portfolio, maximum securitization pool, percentage	12.00%		12.00%

X

- Definition

The amount of accrued interest on loans receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	mbin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Percentage of maximum first loss position the underlying loan portfolio of unpaid principal amount of the loans comprising the securitization pool at settlement.

+ References

No definition available.

+ Details

Name:	mbin_FirstLossPositionInLoanPortfolioMaximumSecuritizationPoolPercentage
Namespace Prefix:	mbin_
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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.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of expense related to credit loss from transactions other than loan and lease transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1

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Balance Type:	debit
Period Type:	duration

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- Details

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