Name:	mofg_AllowanceForLoanLossesUnallocatedMaximumOveragePercentage
Namespace Prefix:	mofg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The maximum percentage that the unallocated portion of the indicated required reserve/allowance for loan losses per Company formula, is permitted to be below the indicated reserve/allowance for loan losses.

No definition available.

Name:	mofg_AllowanceForLoanLossesUnallocatedMaximumShortagePercentage
Namespace Prefix:	mofg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The number of internal criteria required to be met to apply the guidance of ASC Topic 310 (SOP 03-3) concerning accretable yield basis of accounting for interest income to loan pool participations.

No definition available.

Name:	mofg_CriteriaToApplyAscTopic310Number
Namespace Prefix:	mofg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The percentage of loan pool participations contractually 90 days or more past due at balance sheet date.

No definition available.

Name:	mofg_LoanPoolParticipations90DaysOrMorePastDuePercentage
Namespace Prefix:	mofg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The percentage of loan pool participations contractually current or less than 90 days past due at balance sheet date.

No definition available.

Name:	mofg_LoanPoolParticipationsLessThan90DaysPastDuePercentage
Namespace Prefix:	mofg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The number of most recent quarters of historical losses used in estimating future losses, for each loan segment. One of the key factors used in calculating the sufficiency of the allowance for loan losses each fiscal quarter.

No definition available.

Name:	mofg_LoansReviewedCollectivelyForImpairmentHistoricalLossLookbackNumberOfQuarters
Namespace Prefix:	mofg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

For loans classified as substandard "performing collateral dependent", the multiple of the pass classification risk factor used in determining the adequacy of the allowance for loan losses.

No definition available.

Name:	mofg_PerformingCollateralDependentSubstandardLoansAllowanceForLoanLossPassAllocationMultiple
Namespace Prefix:	mofg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

For loans classified as special mention, the multiple of the pass classification risk factor used in determining the adequacy of the allowance for loan losses.

No definition available.

Name:	mofg_SpecialMentionLoansAllowanceForLoanLossPassAllocationMultiple
Namespace Prefix:	mofg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

For loans classified as substandard, the multiple of the pass classification risk factor used in determining the adequacy of the allowance for loan losses.

No definition available.

Name:	mofg_SubstandardLoansAllowanceForLoanLossPassAllocationMultiple
Namespace Prefix:	mofg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18794-111554

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 15

-Paragraph 40

-Subparagraph b.

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.