Loans Serviced for Others (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Loans Serviced for Others [Abstract]
Loans serviced for others	$ 1,200	$ 1,250

The principal balance of loans serviced for others.

No definition available.

Name:	mofg_LoansServicedForOthers
Namespace Prefix:	mofg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant