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Deposits - Brokered deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deposits
Brokered certificates of deposit	$ 4,465,825	$ 2,681,198
Brokered savings deposits	589	81,532
Brokered deposit on demand accounts	1,504,230	13
Total brokered deposits	$ 5,970,644	$ 2,762,743

X

- Definition

The amount of brokered certificate of deposits.

+ References

No definition available.

+ Details

Name:	mbin_BrokeredCertificateOfDeposits
Namespace Prefix:	mbin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of brokered demand deposits.

+ References

No definition available.

+ Details

Name:	mbin_BrokeredDemandDepositAccounts
Namespace Prefix:	mbin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of brokered deposits.

+ References

No definition available.

+ Details

Name:	mbin_BrokeredDeposits
Namespace Prefix:	mbin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of brokered saving deposits.

+ References

No definition available.

+ Details

Name:	mbin_BrokeredDepositsSavingsDeposits
Namespace Prefix:	mbin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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