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Fair Value of Assets and Liabilities - Non Recurring Basis (Details) - Level 3 - Non Recurring
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Foreclosed assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Alternative Investment $ 1,397,460 $ 2,334,560
Alternative Investment, Valuation Technique [Extensible Enumeration] mara:CollateralValuationMember  
Alternative Investment, Measurement Input [Extensible Enumeration] 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