    <SEC-DOCUMENT>0001437749-25-031371-index.html : 20251021
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    ACCESSION NUMBER:		0001437749-25-031371
    CONFORMED SUBMISSION TYPE:	S-4/A
    PUBLIC DOCUMENT COUNT:		26
    FILED AS OF DATE:		20251021
    DATE AS OF CHANGE:		20251020

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			MERCANTILE BANK CORP
    		CENTRAL INDEX KEY:			0001042729
    		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
    		ORGANIZATION NAME:           	02 Finance
    		EIN:				383360865
    		STATE OF INCORPORATION:			MI
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		S-4/A
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-290303
    		FILM NUMBER:		251405133

    	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
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    <FILENAME>mbwm20251009c_s4a.htm
    <DESCRIPTION>FORM S-4/A
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    Document 1 - file: mbwm20251009c_s4a.htm

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    <TYPE>EX-5.1
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    <FILENAME>ex_872109.htm
    <DESCRIPTION>EXHIBIT 5.1
    <TEXT>
    Document 2 - file: ex_872109.htm

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    <TYPE>EX-8.1
    <SEQUENCE>3
    <FILENAME>ex_872107.htm
    <DESCRIPTION>EXHIBIT 8.1
    <TEXT>
    Document 3 - file: ex_872107.htm

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    <TYPE>EX-8.2
    <SEQUENCE>4
    <FILENAME>ex_872108.htm
    <DESCRIPTION>EXHIBIT 8.2
    <TEXT>
    Document 4 - file: ex_872108.htm

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    <DOCUMENT>
    <TYPE>EX-21.1
    <SEQUENCE>5
    <FILENAME>ex_868243.htm
    <DESCRIPTION>EXHIBIT 21.1
    <TEXT>
    Document 5 - file: ex_868243.htm

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    <SEQUENCE>6
    <FILENAME>ex_868244.htm
    <DESCRIPTION>EXHIBIT 23.1
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    Document 6 - file: ex_868244.htm

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    <SEQUENCE>7
    <FILENAME>ex_868245.htm
    <DESCRIPTION>EXHIBIT 23.2
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    Document 7 - file: ex_868245.htm

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    <SEQUENCE>8
    <FILENAME>ex_868246.htm
    <DESCRIPTION>EXHIBIT 99.1
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    Document 8 - file: ex_868246.htm

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    <FILENAME>ex_873123.htm
    <DESCRIPTION>EXHIBIT 99.2
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    Document 9 - file: ex_873123.htm

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    <FILENAME>card01.jpg
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    Document 10 - file: card01.jpg

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    Document 11 - file: card02.jpg

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    Document 13 - file: ex_872109img001.jpg

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    <FILENAME>gt_page1.jpg
    <TEXT>
    Document 14 - file: gt_page1.jpg

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    <FILENAME>gt_page2.jpg
    <TEXT>
    Document 15 - file: gt_page2.jpg

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    Document 16 - file: header51.jpg

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    Document 17 - file: piper.jpg

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    Document 18 - file: piperlogo1.jpg

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    <TEXT>
    Document 19 - file: piperlogo.jpg

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    Document 20 - file: pipersig.jpg

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    <TEXT>
    Document 21 - file: plante1.jpg

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    <FILENAME>plante.jpg
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    Document 22 - file: plante.jpg

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    Document 23 - file: ps2.jpg

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    <FILENAME>ps3.jpg
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    Document 24 - file: ps3.jpg

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    Document 25 - file: screenshot2025-1020193306.jpg

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    <FILENAME>shuym.jpg
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    Document 26 - file: shuym.jpg

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