XML 93 R80.htm IDEA: XBRL DOCUMENT v3.24.0.1

Loans and Allowance for Credit Losses on Loans - Allowance For Credit-Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Allowance for credit losses
Balance, beginning of period				$ 44,014				$ 31,344	$ 44,014	$ 31,344	$ 27,500
Provision for credit losses									37,488	13,473	5,012
Loans charged to the allowance									(9,791)	(1,257)	(1,192)
Recoveries of loans previously charged-off									41	753	24
Balance, end of period	$ 71,752				$ 44,014				71,752	44,014	31,344
ACL Loans
Provision for credit losses	6,747	$ 4,014	$ 22,603	6,867	6,407	$ 2,225	$ 6,212	2,451	40,231	17,295	5,012
Provision for credit losses, ACL Loans									37,500	13,500
Provision for credit losses, ACL-OBCE's									2,700	2,600
Provision for credit losses, ACL-Guarantees										1,200
ASU 2016-13 | Impact from adoption of ASU
Allowance for credit losses
Balance, beginning of period				(299)					(299)
Balance, end of period					(299)					(299)
Mortgage warehouse lines of credit
Allowance for credit losses
Balance, beginning of period				1,249				1,955	1,249	1,955	4,018
Provision for credit losses									821	(747)	(2,063)
Balance, end of period	2,070				1,249				2,070	1,249	1,955
Mortgage warehouse lines of credit | ASU 2016-13 | Impact from adoption of ASU
Allowance for credit losses
Balance, beginning of period				41					41
Balance, end of period					41					41
Residential real estate
Allowance for credit losses
Balance, beginning of period				7,029				4,170	7,029	4,170	3,334
Provision for credit losses									328	2,588	838
Loans charged to the allowance									(34)	(4)	(2)
Balance, end of period	7,323				7,029				7,323	7,029	4,170
Residential real estate | ASU 2016-13 | Impact from adoption of ASU
Allowance for credit losses
Balance, beginning of period				275					275
Balance, end of period					275					275
Multi-family financing
Allowance for credit losses
Balance, beginning of period				16,781				14,084	16,781	14,084	12,140
Provision for credit losses									18,493	2,177	1,944
Loans charged to the allowance									(8,400)
Balance, end of period	26,874				16,781				26,874	16,781	14,084
Multi-family financing | ASU 2016-13 | Impact from adoption of ASU
Allowance for credit losses
Balance, beginning of period				520					520
Balance, end of period					520					520
Healthcare financing
Allowance for credit losses
Balance, beginning of period				9,882				4,461	9,882	4,461	2,591
Provision for credit losses									12,572	5,282	1,870
Balance, end of period	22,454				9,882				22,454	9,882	4,461
Healthcare financing | ASU 2016-13 | Impact from adoption of ASU
Allowance for credit losses
Balance, beginning of period				139					139
Balance, end of period					139					139
Commercial and commercial real estate
Allowance for credit losses
Balance, beginning of period				8,326				5,879	8,326	5,879	4,641
Provision for credit losses									5,232	4,216	2,422
Loans charged to the allowance									(1,356)	(1,238)	(1,184)
Recoveries of loans previously charged-off									41	746
Balance, end of period	12,243				8,326				12,243	8,326	5,879
Commercial and commercial real estate | ASU 2016-13 | Impact from adoption of ASU
Allowance for credit losses
Balance, beginning of period				(1,277)					(1,277)
Balance, end of period					(1,277)					(1,277)
Agricultural production and real estate
Allowance for credit losses
Balance, beginning of period				565				657	565	657	636
Provision for credit losses									54	(74)	21
Balance, end of period	619				565				619	565	657
Agricultural production and real estate | ASU 2016-13 | Impact from adoption of ASU
Allowance for credit losses
Balance, beginning of period				(18)					(18)
Balance, end of period					(18)					(18)
Consumer and margin loans
Allowance for credit losses
Balance, beginning of period				182				$ 138	182	138	140
Provision for credit losses									(12)	31	(20)
Loans charged to the allowance									(1)	(15)	(6)
Recoveries of loans previously charged-off										7	24
Balance, end of period	$ 169				182				169	182	$ 138
Consumer and margin loans | ASU 2016-13 | Impact from adoption of ASU
Allowance for credit losses
Balance, beginning of period				$ 21					$ 21
Balance, end of period					$ 21					$ 21

X

- Definition

The provision for credits losses for the contingent reserve related to the Freddie Mac-sponsored Q-series securitization transaction.

+ References

No definition available.

+ Details

Name:	mbin_ProvisionForCreditLossesFreddieMacSecuritizationTransaction
Namespace Prefix:	mbin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

+ Details

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

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

X

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

+ Details

Name:	us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-SubTopic 10
-Topic 310
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1

+ Details

Name:	us-gaap_ProvisionForLoanLeaseAndOtherLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of credit loss expense (reversal of expense) for financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1

+ Details

Name:	us-gaap_ProvisionForLoanLossesExpensed
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201613Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mbin_MortgageWarehouseLinesOfCreditPortfolioSegmentMember
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_FinancingReceivablePortfolioSegmentAxis=mbin_MultiFamilyFinancingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mbin_HealthCareFinancingMember
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_FinancingReceivablePortfolioSegmentAxis=mbin_AgriculturalProductionAndRealEstatePortfolioSegmentMember
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: