XML 96 R78.htm IDEA: XBRL DOCUMENT v3.25.0.1

Note 6 - Deposits (Details Textual) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Time Deposits, at or Above FDIC Insurance Limit	$ 570.0	$ 477.0
Loans [Member]
Deposit Overdrafts	$ 1.0	$ 0.3

X

- Definition

Represents the proceeds from deposit overdrafts

+ References

No definition available.

+ Details

Name:	mbwm_DepositOverdrafts
Namespace Prefix:	mbwm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 405
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478353/942-405-50-1

+ Details

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

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_LoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: