XML 99 R54.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Securities Sold Under Agreements To Repurchase (Details Textual) | 6 Months Ended
--- | ---
Jun. 30, 2013
Short-Term Borrowings (Textual) [Abstract] |
Repurchase agreements original maturity description | less than one year

X
- Details
Name: | mbwm_ShortTermBorrowingsTextualAbstract
Namespace Prefix: | mbwm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This describes the time frame of the terms of the entity's repurchase agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_RepurchaseAgreementsMaturities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration