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Fair Value of Assets and Liabilities - Non Recurring Basis (Details) - Level 3 - Non Recurring
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Foreclosed assets (OREO), net    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Alternative investment $ 996,373 $ 1,375,140
Alternative Investment, Valuation Technique [Extensible Enumeration] mara:CollateralValuationMember mara:CollateralValuationMember
Alternative Investment, Measurement Input [Extensible Enumeration] us-gaap:MeasurementInputDiscountRateMember us-gaap:MeasurementInputDiscountRateMember
Collateral dependent financial assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Alternative investment $ 66,645  
Alternative Investment, Valuation Technique [Extensible Enumeration] mara:AppraisalValuationMember mara:AppraisalValuationMember
Alternative investment, measurement input 0 0
Alternative Investment, Measurement Input [Extensible Enumeration] us-gaap:MeasurementInputDiscountRateMember us-gaap:MeasurementInputDiscountRateMember
Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Alternative investment, measurement input 0.10 0.10
Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Alternative investment, measurement input 0.75 0.75