XML 50 R37.htm IDEA: XBRL DOCUMENT v3.22.4

Note 5 - Mortgage Loan Servicing (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Mortgage Loans Serviced for Others [Table Text Block]

		2022				2021
Mortgage loan portfolios serviced for:
Federal Home Loan Mortgage Corporation		$	1,345,312,000			$	1,320,550,000
Federal Home Loan Bank			30,831,000				23,505,000
Total mortgage loans serviced for others		$	1,376,143,000			$	1,344,055,000

Servicing Asset at Amortized Cost [Table Text Block]

		2022				2021
Balance at beginning of year		$	12,248,000			$	8,189,000
Additions			2,773,000				7,711,000
Amortized to expense			(3,184,000	)			(3,652,000	)
Balance at end of year		$	11,837,000			$	12,248,000

Schedule of Mortgage Servicing Rights Future Amortization Expense [Table Text Block]

2023		$	2,366,000
2024			2,066,000
2025			1,772,000
2026			1,492,000
2027			1,236,000
Thereafter			2,905,000

X

- Definition

Tabular disclosure on mortgage loan portfolios serviced for others.

+ References

No definition available.

+ Details

Name:	mbwm_MortgageLoansServicedForOthersTableTextBlock
Namespace Prefix:	mbwm_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for mortgage servicing rights.

+ References

No definition available.

+ Details

Name:	mbwm_ScheduleOfMortgageServicingRightsFutureAmortizationExpenseTableTextBlock
Namespace Prefix:	mbwm_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of activity in the balance of servicing assets subsequently measured at amortized cost. Includes, but is not limited to, beginning and ending balances, additions, disposals, and amortization.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122739-111746

+ Details

Name:	us-gaap_ScheduleOfServicingAssetsAtAmortizedValueTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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