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Deposits - Brokered deposits (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deposits |  |
Brokered certificates of deposit | $ 5,351,397 | $ 4,465,825
Brokered savings deposits | 1,338 | 589
Brokered deposit on demand accounts | 400,159 | 1,504,230
Total brokered deposits | $ 5,752,894 | $ 5,970,644

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