XML 61 R60.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Fair Values (Details 1) (Fair Value, Measurements, Nonrecurring [Member], USD $) | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Assets measured at fair value on a nonrecurring basis |  |
Impaired loans | $ 31,767,000 | $ 34,406,000
Foreclosed assets | 6,506,000 | 6,970,000
Total | 38,273,000 | 41,376,000
Level 1 [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Impaired loans | 0 | 0
Foreclosed assets | 0 | 0
Total | 0 | 0
Level 2 [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Impaired loans | 0 | 0
Foreclosed assets | 0 | 0
Total | 0 | 0
Level 3 [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Impaired loans | 31,767,000 | 34,406,000
Foreclosed assets | 6,506,000 | 6,970,000
Total | $ 38,273,000 | $ 41,376,000

X
- Definition Asset liabilities fair value disclosure. + References No definition available. + Details
Name: | mbwm_AssetLiabilitiesFairValueDisclosure
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Foreclosed assets fair value disclosure. + References No definition available. + Details
Name: | mbwm_ForeclosedAssetsFairValueDisclosure
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Impaired loans fair value disclosure. + References No definition available. + Details
Name: | mbwm_ImpairedLoansFairValueDisclosure
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration