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v3.25.2

Commitments and Contingent Liabilities (Details) - USD ($) | Jun. 30, 2025 | Jun. 30, 2024
--- | --- | ---
Other Commitments [Line Items] |  |
Percentage outstanding with fixed interest rate | 98.23% | 19.00%
Percentage outstanding with variable interest rate | 1.77% | 81.00%
Commitments to grant loans |  |
Other Commitments [Line Items] |  |
Other commitments | $ 4,790,000 | $ 1,341,500
Unused commitments under lines of credit |  |
Other Commitments [Line Items] |  |
Other commitments | 6,346,008 | 3,691,619
MPF credit enhancements |  |
Other Commitments [Line Items] |  |
Other commitments | $ 735,448 | $ 658,008

X
- Definition Represents percentage of outstanding commitments to grant loans with fixed interest rates. + References No definition available. + Details
Name: | mara_CommitmentsToGrantLoansPercentageOutstandingWithFixedInterestRate
Namespace Prefix: | mara_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents percentage of outstanding commitments to grant loans with variable interest rates. + References No definition available. + Details
Name: | mara_CommitmentsToGrantLoansPercentageOutstandingWithVariableInterestRate
Namespace Prefix: | mara_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=mara_CommitmentsToGrantLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=mara_UnusedCommitmentsUnderLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=mara_MortgagePartnershipFinanceCreditEnhancementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |