XML 118 R110.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Note 13 - Related Parties (Details) - Loans Outstanding to Directors and Executive Officers (Directors and Executive Officers [Member], USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Directors and Executive Officers [Member] |  |
Related Party Transaction [Line Items] |  |
Beginning balance | $ 6,884,000 us-gaap_LoansAndLeasesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mbwm_DirectorsAndExecutiveOfficersMember | $ 1,418,000 us-gaap_LoansAndLeasesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mbwm_DirectorsAndExecutiveOfficersMember
New loans | 781,000 us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mbwm_DirectorsAndExecutiveOfficersMember | 6,309,000 us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mbwm_DirectorsAndExecutiveOfficersMember
Repayments | (381,000)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mbwm_DirectorsAndExecutiveOfficersMember | (252,000)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mbwm_DirectorsAndExecutiveOfficersMember
Adjustments | 1,718,000 mbwm_LoansAndLeasesReceivableRelatedPartiesAdjustments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mbwm_DirectorsAndExecutiveOfficersMember | (591,000)mbwm_LoansAndLeasesReceivableRelatedPartiesAdjustments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mbwm_DirectorsAndExecutiveOfficersMember
Ending balance | $ 9,002,000 us-gaap_LoansAndLeasesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mbwm_DirectorsAndExecutiveOfficersMember | $ 6,884,000 us-gaap_LoansAndLeasesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mbwm_DirectorsAndExecutiveOfficersMember

X
- Definition Represents the addition (reduction) in related party's loan balances due to the Firstbank merger and Board member retirements. + References No definition available. + Details
Name: | mbwm_LoansAndLeasesReceivableRelatedPartiesAdjustments
Namespace Prefix: | mbwm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
Name: | us-gaap_LoansAndLeasesReceivableRelatedParties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reflects the amount of new advances made to related parties in the form of loan and lease receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
Name: | us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reflects the amount of collections received from related parties to reduce the carrying amounts of loans and leases receivable due from them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
Name: | us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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