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Consolidated Statements of Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Consolidated Statements of Income
Reclassifications included in gains on sale of investment available for sale	$ 0	$ 0	$ 191
Provision for income taxes related to income tax expense for reclassification items	$ 0	$ 0	$ 46

X

- Definition

The amount related to accumulated other comprehensive earnings reclassifications included in the total gain (loss) on sale of investments.

+ References

No definition available.

+ Details

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X

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) related to reclassification items.

+ References

No definition available.

+ Details

Name:	mbin_IncomeTaxExpenseBenefitRelatedToReclassificationItems
Namespace Prefix:	mbin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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