XML 11 R39.htm IDEA: XBRL DOCUMENT v2.4.0.8

Note 3 - Loans and Allowance for Loan Losses (Details) - Components of Loan Portfolio Disaggregated by Class of Loan and Percentage Change in Total Loans (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans- Balance (in Dollars)	$ 1,066,796,000	$ 1,053,243,000	$ 1,022,956,000
Loans- Percentage	100.00%	100.00%
Loans-Percent Increase (Decrease)	1.30%
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans- Balance (in Dollars)	289,009,000	286,373,000
Loans- Percentage	27.10%	27.20%
Loans-Percent Increase (Decrease)	0.90%
Commercial Vacant Land And Land Development And Residential Construction Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans- Balance (in Dollars)	37,190,000	36,741,000
Loans- Percentage	3.50%	3.50%
Loans-Percent Increase (Decrease)	1.20%
Commercial Real Estate Owner Occupied Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans- Balance (in Dollars)	264,299,000	261,877,000
Loans- Percentage	24.80%	24.90%
Loans-Percent Increase (Decrease)	0.90%
Commercial Real Estate Non Owner Occupied Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans- Balance (in Dollars)	378,034,000	364,066,000
Loans- Percentage	35.40%	34.60%
Loans-Percent Increase (Decrease)	3.80%
Commercial Real Estate Multi Family And Residential Rental Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans- Balance (in Dollars)	35,686,000	37,639,000
Loans- Percentage	3.30%	3.50%
Loans-Percent Increase (Decrease)	(5.20%)
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans- Balance (in Dollars)	1,004,218,000	986,696,000
Loans- Percentage	94.10%	93.70%
Loans-Percent Increase (Decrease)	1.80%
Retail Home Equity And Other Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans- Balance (in Dollars)	31,778,000	35,080,000
Loans- Percentage	3.00%	3.30%
Loans-Percent Increase (Decrease)	(9.40%)
Retail Family Mortgages Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans- Balance (in Dollars)	30,800,000	31,467,000
Loans- Percentage	2.90%	3.00%
Loans-Percent Increase (Decrease)	(2.10%)
Retail Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans- Balance (in Dollars)	$ 62,578,000	$ 66,547,000
Loans- Percentage	5.90%	6.30%
Loans-Percent Increase (Decrease)	(6.00%)

X

- Definition

Loan portfolio classes and segments as a percentage of aggregate loans.

+ References

No definition available.

+ Details

Name:	mbwm_LoanPortfolioClassesAndSegmentsAsPercentageOfAggregateLoan
Namespace Prefix:	mbwm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Loans and leases receivable net of deferred income increase decrease percentage.

+ References

No definition available.

+ Details

Name:	mbwm_LoansAndLeasesReceivableNetOfDeferredIncomeIncreaseDecreasePercentage
Namespace Prefix:	mbwm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

+ Details

Name:	us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant