v3.21.1

Loans Receivable and the Allowance for Credit Losses - Nonaccrual Status and Interest Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due
Nonaccrual	$ 43,874		$ 41,950
Nonaccrual with no Allowance for Credit Losses	18,388		16,739
90 Days or More Past Due And Accruing	508		739
Interest Income Recognized on Nonaccrual	236	$ 272
Agricultural
Financing Receivable, Recorded Investment, Past Due
Nonaccrual	2,824		2,584
Nonaccrual with no Allowance for Credit Losses	2,220		1,599
90 Days or More Past Due And Accruing	0		0
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due
Nonaccrual	6,494		7,326
Nonaccrual with no Allowance for Credit Losses	3,401		4,349
90 Days or More Past Due And Accruing	6		106
Commercial real estate
Financing Receivable, Recorded Investment, Past Due
Nonaccrual	31,868		29,344
Nonaccrual with no Allowance for Credit Losses	12,400		10,702
90 Days or More Past Due And Accruing	0		0
Commercial real estate | Construction & development
Financing Receivable, Recorded Investment, Past Due
Nonaccrual	619		1,145
Nonaccrual with no Allowance for Credit Losses	596		900
90 Days or More Past Due And Accruing	0		0
Commercial real estate | Farmland
Financing Receivable, Recorded Investment, Past Due
Nonaccrual	10,458		8,319
Nonaccrual with no Allowance for Credit Losses	8,834		7,266
90 Days or More Past Due And Accruing	0		0
Commercial real estate | Multifamily
Financing Receivable, Recorded Investment, Past Due
Nonaccrual	1,096		746
Nonaccrual with no Allowance for Credit Losses	37		39
90 Days or More Past Due And Accruing	0		0
Commercial real estate | Commercial real estate-other
Financing Receivable, Recorded Investment, Past Due
Nonaccrual	19,695		19,134
Nonaccrual with no Allowance for Credit Losses	2,933		2,497
90 Days or More Past Due And Accruing	0		0
Residential real estate
Financing Receivable, Recorded Investment, Past Due
Nonaccrual	2,610		2,617
Nonaccrual with no Allowance for Credit Losses	354		76
90 Days or More Past Due And Accruing	502		625
Residential real estate | One- to four- family first liens
Financing Receivable, Recorded Investment, Past Due
Nonaccrual	1,863		1,895
Nonaccrual with no Allowance for Credit Losses	353		75
90 Days or More Past Due And Accruing	468		625
Residential real estate | One- to four- family junior liens
Financing Receivable, Recorded Investment, Past Due
Nonaccrual	747		722
Nonaccrual with no Allowance for Credit Losses	1		1
90 Days or More Past Due And Accruing	34		0
Consumer
Financing Receivable, Recorded Investment, Past Due
Nonaccrual	78		79
Nonaccrual with no Allowance for Credit Losses	13		13
90 Days or More Past Due And Accruing	$ 0		$ 8

X

- Definition

Amount of interest income on financing receivable on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447

+ Details

Name:	us-gaap_FinancingReceivableNonaccrualInterestIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of financing receivable on nonaccrual status with no allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447

+ Details

Name:	us-gaap_FinancingReceivableNonaccrualNoAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of financing receivable 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 80
-URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of financing receivable on nonaccrual status.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mofg_AgriculturalPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mofg_ConstructionAndDevelopmentLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mofg_FarmlandLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mofg_MultifamilyRealEstateLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mofg_CommercialRealEstateOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mofg_FirstLienLoanFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mofg_JuniorLienLoanFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: