    <SEC-DOCUMENT>0001437749-23-028327-index.html : 20231017
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    <ACCEPTANCE-DATETIME>20231017091024
    ACCESSION NUMBER:		0001437749-23-028327
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		55
    CONFORMED PERIOD OF REPORT:	20231012
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20231017
    DATE AS OF CHANGE:		20231017

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			MERCANTILE BANK CORP
    		CENTRAL INDEX KEY:			0001042729
    		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
    		IRS NUMBER:				383360865
    		STATE OF INCORPORATION:			MI
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-26719
    		FILM NUMBER:		231328576

    	BUSINESS ADDRESS:
    		STREET 1:		310 LEONARD STREET NW
    		CITY:			GRAND RAPIDS
    		STATE:			MI
    		ZIP:			49504
    		BUSINESS PHONE:		616 406-3000

    	MAIL ADDRESS:
    		STREET 1:		310 LEONARD STREET NW
    		CITY:			GRAND RAPIDS
    		STATE:			MI
    		ZIP:			49504
    </SEC-HEADER>
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    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>mbwm20231016_8k.htm
    <DESCRIPTION>FORM 8-K
    <TEXT>
    Document 1 - file: mbwm20231016_8k.htm

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    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>ex_581307.htm
    <DESCRIPTION>EXHIBIT 99.1
    <TEXT>
    Document 2 - file: ex_581307.htm

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    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>ex_581306.htm
    <DESCRIPTION>EXHIBIT 99.2
    <TEXT>
    Document 3 - file: ex_581306.htm

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    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>4
    <FILENAME>mbwm-20231012.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
    <TEXT>
    Document 4 - file: mbwm-20231012.xsd

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    <FILENAME>mbwm-20231012_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE
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    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>6
    <FILENAME>mbwm-20231012_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE
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    <DOCUMENT>
    <TYPE>EX-101.PRE
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    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE
    <TEXT>
    Document 7 - file: mbwm-20231012_pre.xml

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>pic01.jpg
    <TEXT>
    Document 8 - file: pic01.jpg

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    <DOCUMENT>
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    <SEQUENCE>9
    <FILENAME>pic02.jpg
    <TEXT>
    Document 9 - file: pic02.jpg

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    <SEQUENCE>10
    <FILENAME>pic03.jpg
    <TEXT>
    Document 10 - file: pic03.jpg

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    <SEQUENCE>11
    <FILENAME>pic04.jpg
    <TEXT>
    Document 11 - file: pic04.jpg

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    <SEQUENCE>12
    <FILENAME>pic05.jpg
    <TEXT>
    Document 12 - file: pic05.jpg

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    <SEQUENCE>13
    <FILENAME>pic06.jpg
    <TEXT>
    Document 13 - file: pic06.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>pic07.jpg
    <TEXT>
    Document 14 - file: pic07.jpg

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    <SEQUENCE>15
    <FILENAME>pic08.jpg
    <TEXT>
    Document 15 - file: pic08.jpg

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    <SEQUENCE>16
    <FILENAME>pic09.jpg
    <TEXT>
    Document 16 - file: pic09.jpg

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    <SEQUENCE>17
    <FILENAME>pic10.jpg
    <TEXT>
    Document 17 - file: pic10.jpg

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    <SEQUENCE>18
    <FILENAME>pic11.jpg
    <TEXT>
    Document 18 - file: pic11.jpg

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    <SEQUENCE>19
    <FILENAME>pic12.jpg
    <TEXT>
    Document 19 - file: pic12.jpg

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    <SEQUENCE>20
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    <TEXT>
    Document 20 - file: pic13.jpg

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    <SEQUENCE>21
    <FILENAME>pic14.jpg
    <TEXT>
    Document 21 - file: pic14.jpg

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    <SEQUENCE>22
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    <TEXT>
    Document 22 - file: pic15.jpg

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    <SEQUENCE>23
    <FILENAME>pic16.jpg
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    Document 23 - file: pic16.jpg

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    <SEQUENCE>24
    <FILENAME>pic17.jpg
    <TEXT>
    Document 24 - file: pic17.jpg

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    <SEQUENCE>25
    <FILENAME>pic18.jpg
    <TEXT>
    Document 25 - file: pic18.jpg

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    <SEQUENCE>26
    <FILENAME>pic19.jpg
    <TEXT>
    Document 26 - file: pic19.jpg

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    <SEQUENCE>27
    <FILENAME>pic20.jpg
    <TEXT>
    Document 27 - file: pic20.jpg

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    <SEQUENCE>28
    <FILENAME>pic21.jpg
    <TEXT>
    Document 28 - file: pic21.jpg

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    <SEQUENCE>29
    <FILENAME>pic22.jpg
    <TEXT>
    Document 29 - file: pic22.jpg

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    <SEQUENCE>30
    <FILENAME>pic23.jpg
    <TEXT>
    Document 30 - file: pic23.jpg

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    <SEQUENCE>31
    <FILENAME>pic24.jpg
    <TEXT>
    Document 31 - file: pic24.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>32
    <FILENAME>pic25.jpg
    <TEXT>
    Document 32 - file: pic25.jpg

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    <SEQUENCE>33
    <FILENAME>pic26.jpg
    <TEXT>
    Document 33 - file: pic26.jpg

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    <SEQUENCE>34
    <FILENAME>pic27.jpg
    <TEXT>
    Document 34 - file: pic27.jpg

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    <SEQUENCE>35
    <FILENAME>pic28.jpg
    <TEXT>
    Document 35 - file: pic28.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>36
    <FILENAME>pic29.jpg
    <TEXT>
    Document 36 - file: pic29.jpg

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    <SEQUENCE>37
    <FILENAME>pic30.jpg
    <TEXT>
    Document 37 - file: pic30.jpg

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    <SEQUENCE>38
    <FILENAME>pic31.jpg
    <TEXT>
    Document 38 - file: pic31.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>39
    <FILENAME>pic32.jpg
    <TEXT>
    Document 39 - file: pic32.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>40
    <FILENAME>pic33.jpg
    <TEXT>
    Document 40 - file: pic33.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>41
    <FILENAME>pic34.jpg
    <TEXT>
    Document 41 - file: pic34.jpg

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    <SEQUENCE>42
    <FILENAME>pic35.jpg
    <TEXT>
    Document 42 - file: pic35.jpg

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    <SEQUENCE>43
    <FILENAME>pic36.jpg
    <TEXT>
    Document 43 - file: pic36.jpg

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    <SEQUENCE>44
    <FILENAME>pic37.jpg
    <TEXT>
    Document 44 - file: pic37.jpg

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    <SEQUENCE>45
    <FILENAME>pic38.jpg
    <TEXT>
    Document 45 - file: pic38.jpg

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    <SEQUENCE>46
    <FILENAME>pic39.jpg
    <TEXT>
    Document 46 - file: pic39.jpg

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    <SEQUENCE>47
    <FILENAME>pic40.jpg
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    Document 47 - file: pic40.jpg

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    <DESCRIPTION>IDEA: XBRL DOCUMENT
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    Document 48 - file: R1.htm

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    Document 49 - RAW XML: mbwm20231016_8k_htm.xml

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    <TYPE>EXCEL
    <SEQUENCE>50
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    <TEXT>
    Document 50 - file: Financial_Report.xlsx

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    <SEQUENCE>51
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    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 51 - file: Show.js

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    <SEQUENCE>52
    <FILENAME>report.css
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    Document 52 - file: report.css

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    <TYPE>XML
    <SEQUENCE>53
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    Document 53 - file: FilingSummary.html

    Document 53 - RAW XML: FilingSummary.xml

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    <SEQUENCE>55
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    Document 55 - file: MetaLinks.json

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