Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Revenue Recognition
Amount of employee retention credit benefit of other income and other non-interest income	$ 215	$ 215

Amount of employee retention credit under CARES Act recognized during the period.

No definition available.

Name:	mpic_EmployeeRetentionCreditCaresAct
Namespace Prefix:	mpic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration