XML 52 R34.htm IDEA: XBRL DOCUMENT v3.25.0.1

Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Mortgage Loans Held for Sale [Table Text Block]

(Dollars in thousands)		2024				2023
Mortgage loans held for sale		$	15,824			$	18,607
Less: Allowance to adjust to lower of cost or market			0				0
Mortgage loans held for sale, net		$	15,824			$	18,607

Revenue from External Customers by Products and Services [Table Text Block]

(Dollars in thousands)		2024				2023				2022
Service charges on deposit and sweep accounts		$	6,842			$	4,954			$	5,952
Credit and debit card fees			8,821				8,914				8,216
Payroll processing			3,058				2,509				2,178
Customer service fees			797				801				852

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

(Dollars in thousands)		2024				2023				2022
Unrealized gains (losses) on securities available for sale		$	(63,070	)		$	(63,906	)		$	(82,710	)
Tax effect			13,245				13,419				17,369
Accumulated other comprehensive gain/(loss)		$	(49,825	)		$	(50,487	)		$	(65,341	)

X

- Definition

Tabular disclosure of year-end mortgage loans held for sale.

+ References

No definition available.

+ Details

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

X

- Definition

Tabular disclosure of the components of accumulated other comprehensive income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

+ Details

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

X

- Definition

Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-40

+ Details

Name:	us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock
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