XML 31 R2.htm IDEA: XBRL DOCUMENT
v3.24.1

Pay vs Performance Disclosure | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Pay vs Performance Disclosure |  |  |  |
Pay vs Performance Disclosure, Table |
Pay Versus Performance
In accordance with rules adopted by the SEC pursuant to the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, we are providing the following disclosures regarding executive compensation for our principal executive officer (“PEO”) and Non-PEO named executive officers (“Non-PEO NEOs”) and Company performance for the fiscal years listed below. We have identified Return on Equity (“ROE”) as our Company-Selected Measure (“CSM”). In our view, ROE represents the most important financial performance measure (not otherwise required to be disclosed in the table) used to link “Compensation Actually Paid” to our NEOs for the 2023 fiscal year to company performance. We chose ROE as our Company-Selected Measure for evaluating pay versus performance because it is a key metric in our 2023 executive officer bonus plan as well as under the performance-based restricted stock grants made in 2023. See Compensation Discussion and Analysis—Bonus Plan for 2023 on page 31 and Compensation Discussion and Analysis – Grant of Performance-Based Restricted Stock for the 2024-2026 Performance Period on page 36 for a discussion of the metrics used by the Compensation Committee to evaluate performance. Pay Versus Performance Table
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Value of initial fixed $100 investment based on: |  |  |  |  |  |  |  |  |
|  | Summary compensation table total for PEO (1) |  |  | Compensation actually paid to PEO (2)(3) |  |  | Average summary compensation table total for non-PEO named executive officers (1) |  |  | Average compensation actually paid to non-PEO named executive officers (2)(3) |  |  | Total shareholder return |  |  | Peer group total shareholder return(4) |  |  | Net income |  |  | Return on |
(a) |  | (b) |  |  | (c) |  |  | (d) |  |  | (e) |  |  | (f) |  |  | (g) |  |  | (h) |  |  | equity |
2023 |  | $ | 1,477,989 |  |  | $ | 1,789,395 |  |  | $ | 694,860 |  |  | $ | 812,860 |  |  |  | 173.48 |  |  |  | 131.57 |  |  | $ | 82,217,000 |  |  |  | 17.24 | %
2022 |  | $ | 1,430,026 |  |  | $ | 1,679,446 |  |  | $ | 558,287 |  |  | $ | 605,716 |  |  |  | 116.19 |  |  |  | 109.23 |  |  | $ | 61,063,000 |  |  |  | 14.07 | %
2021 |  | $ | 1,208,919 |  |  | $ | 2,033,701 |  |  | $ | 608,292 |  |  | $ | 1,021,656 |  |  |  | 117.18 |  |  |  | 138.97 |  |  | $ | 59,021,000 |  |  |  | 13.11 | %
2020 |  | $ | 1,087,367 |  |  | $ | 645,575 |  |  | $ | 609,392 |  |  | $ | 490,267 |  |  |  | 87.59 |  |  |  | 100.46 |  |  | $ | 44,138,000 |  |  |  | 10.32 | %
(1) | Robert B. Kaminski, Jr. was our PEO for each year presented. The non-PEO NEOs for 2022 and 2021 are Raymond E. Reitsma, Charles E. Christmas, Lonna L. Wiersma and Robert T. Worthington. The non-PEO NEOs for 2023 are Raymond E. Reitsma, Charles E. Christmas, Brett E. Hoover, and Robert T. Worthington. Ms. Wiersma retired on March 4, 2022.
(2) | Compensation Actually Paid amounts shown have been calculated in accordance with Item 402(v) of Regulation 402(v) of Regulation S-K and do not reflect compensation actually earned, realized or received by the NEOs.
(3) | Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEO and the non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. For each NEO, we have subtracted the totals from the Stock Awards column set forth in the Summary Compensation Table. The equity value adjustments for each applicable year are derived from the following tables.
(4) | The peer group TSR set forth in this table utilizes the KBW Nasdaq Bank Index, which we also utilize in the stock performance graph required by Item 201(e) of Regulation S-K included in our Annual Report for the year ended December 31, 2023. The comparison assumes $100 was invested for the period starting December 31, 2019, through the end of the listed year in the Company and in the KBW Nasdaq Bank Index, respectively. Historical stock performance is not necessarily indicative of future stock performance.
| MERCANTILE BANK CORPORATION | 2024 PROXY STATEMENT | 53
PEO Total Compensation Amount | $ 1,477,989 | $ 1,430,026 | $ 1,208,919 | $ 1,087,367
PEO Actually Paid Compensation Amount | $ 1,789,395 | 1,679,446 | 2,033,701 | 645,575
Adjustment To PEO Compensation, Footnote |
Year |  | Year-End Fair Value of Equity Granted During Year That Remained Unvested as of Last Day of Year for PEO ($) |  |  | Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for PEO ($) |  |  | Vesting Date Fair Value of Equity Awards Granted During Year that Vested During Year for PEO ($) |  |  | Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for PEO ($) |  |  | Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for PEO ($) |  |  | Value of Dividends or Other Earnings Paid on Stock or Option Awards Not Otherwise Included for PEO ($) |  |  | Total Inclusion of Equity Values for PEO ($) |
2023 |  |  | 349,973 |  |  |  | 289,654 |  |  |  | - |  |  |  | 17,452 |  |  |  | - |  |  |  | 56,252 |  |  |  | 713,331 |
2022 |  |  | 381,873 |  |  |  | 156,752 |  |  |  | - |  |  |  | 31,830 |  |  |  | - |  |  |  | 45,098 |  |  |  | 615,553 |
2021 |  |  | 351,106 |  |  |  | 802,132 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 20,244 |  |  |  | 1,173,482 |
2020 |  |  | 287,975 |  |  |  | (402,776 | ) |  |  | - |  |  |  | (64,020 | ) |  |  | - |  |  |  | 22,460 |  |  |  | (156,361 | )
Non-PEO NEO Average Total Compensation Amount | $ 694,860 | 558,287 | 608,292 | 609,392
Non-PEO NEO Average Compensation Actually Paid Amount | $ 812,860 | 605,716 | 1,021,656 | 490,267
Adjustment to Non-PEO NEO Compensation Footnote |
Year |  | Average Year-End Fair Value of Equity Granted During Year That Remained Unvested as of Last Day of Year for Non-PEO ($) |  |  | Average Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Non-PEO ($) |  |  | Average Vesting Date Fair Value of Equity Awards Granted During Year that Vested During Year for Non-PEO ($) |  |  | Average Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Non-PEO ($) |  |  | Average Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for Non-PEO ($) |  |  | Average Value of Dividends or Other Earnings Paid on Stock or Option Awards Not Otherwise Included for Non-PEO ($) |  |  | Total Average Inclusion of Equity Values for Non-PEO ($) |
2023 |  |  | 167,294 |  |  |  | 108,863 |  |  |  | - |  |  |  | 8,033 |  |  |  | - |  |  |  | 21,488 |  |  |  | 305,678 |
2022 |  |  | 123,089 |  |  |  | 41,682 |  |  |  | - |  |  |  | 18,927 |  |  |  | (35,626 | ) |  |  | 17,372 |  |  |  | 165,444 |
2021 |  |  | 111,045 |  |  |  | 402,580 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 10,024 |  |  |  | 523,649 |
2020 |  |  | 140,578 |  |  |  | (93,241 | ) |  |  | - |  |  |  | (39,285 | ) |  |  | - |  |  |  | 12,160 |  |  |  | 20,212 |
Compensation Actually Paid vs. Total Shareholder Return | Relationship Between PEO and Other NEO Compensation Actually Paid and Company Total Shareholder Return (“TSR”) The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our other NEOs, and the Company’s cumulative TSR as well as TSR relative to the KBW Nasdaq Bank Index, over the four most recently completed fiscal years.
54 | MERCANTILE BANK CORPORATION | 2024 PROXY STATEMENT |
Compensation Actually Paid vs. Net Income | Relationship Between PEO and Other NEO Compensation Actually Paid and Net Income The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our other NEOs, and our net income during the three most recently completed fiscal years. |  |  |
Compensation Actually Paid vs. Company Selected Measure | Relationship Between PEO and Other NEO Compensation Actually Paid and Return on Equity (”ROE”) The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our other NEOs, and our ROE during the three most recently completed fiscal years. |  |  |
Tabular List, Table | Tabular List of Most Important Performance Measures The following table presents the financial performance measures that the Company considers to be the most important in linking Compensation Actually Paid to our PEO and other NEOs for 2023 to Company performance. The measures in this table are not ranked.
Earnings per share
Level of non-performing assets
Net interest margin
Net revenue
Efficiency ratio
Return on assets
Return on equity
| MERCANTILE BANK CORPORATION | 2024 PROXY STATEMENT | 55
Total Shareholder Return Amount | $ 173.48 | 116.19 | 117.18 | 87.59
Peer Group Total Shareholder Return Amount | 131.57 | 109.23 | 138.97 | 100.46
Net Income (Loss) | $ 82,217,000 | $ 61,063,000 | $ 59,021,000 | $ 44,138,000
Company Selected Measure Amount | 17.24 | 14.07 | 13.11 | 10.32
Measure:: 1 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Earnings per share |  |  |
Measure:: 2 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Level of non-performing assets |  |  |
Measure:: 3 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Net interest margin |  |  |
Measure:: 4 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Net revenue |  |  |
Measure:: 5 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Efficiency ratio |  |  |
Measure:: 6 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Return on assets |  |  |
Measure:: 7 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Return on equity |  |  |
PEO Year-End Fair Value Of Equity Granted During Year That Remained Unvested As Of Last Day Of Year PEO [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | $ 349,973 | $ 381,873 | $ 351,106 | $ 287,975
PEO Change In Fair Value From Last Day Of Prior Year To Last Day Of Year Of Unvested Equity Awards For PEO [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 289,654 | 156,752 | 802,132 | (402,776)
PEO Vesting Date Fair Value of Equity Awards Granted During Year that Vested During Year for PEO [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | 0 | 0
PEO Change In Fair Value From Last Day Of Prior Year To Vesting Date Of Unvested Equity Awards That Vested During Year For PEO [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 17,452 | 31,830 | 0 | (64,020)
PEO Fair Value At Last Day Of Prior Year Of Equity Awards Forfeited During Year For PEO [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | 0 | 0
PEO Value Of Dividends Or Other Earnings Paid On Stock Or Option Awards Not Otherwise Included For PEO [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 56,252 | 45,098 | 20,244 | 22,460
PEO Total Inclusion Of Equity Values For PEO [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 713,331 | 615,553 | 1,173,482 | (156,361)
NEO Average Year-End Fair Value Of Equity Granted During Year That Remained Unvested As Of Last Day Of Year For Non-PEO [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 167,294 | 123,089 | 111,045 | 140,578
NEO Average Change In Fair Value From Last Day Of Prior Year To Last Day Of Year Of Unvested Equity Awards For Non-PEO [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 108,863 | 41,682 | 402,580 | (93,241)
NEO Average Vesting Date Fair Value Of Equity Awards Granted During Year That Vested During Year For Non-PEO [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | 0 | 0
NEO Average Change In Fair Value From Last Day Of Prior Year To Vesting Date Of Unvested Equity Awards That Vested During Year For Non-PEO [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 8,033 | 18,927 | 0 | (39,285)
NEO Average Fair Value At Last Day Of Prior Year Of Equity Awards Forfeited During Year For Non-PEO [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 | (35,626) | 0 | 0
NEO Average Value Of Dividends Or Other Earnings Paid On Stock Or Option Awards Not Otherwise Included For Non-PEO [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 21,488 | 17,372 | 10,024 | 12,160
NEO Total Average Inclusion Of Equity Values For Non-PEO [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | $ 305,678 | $ 165,444 | $ 523,649 | $ 20,212

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 3 + Details
Name: | ecd_AdjToCompAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 3 + Details
Name: | ecd_AdjToNonPeoNeoCompFnTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 3 + Details
Name: | ecd_AdjToPeoCompFnTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph vi + Details
Name: | ecd_CoSelectedMeasureAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 5 -Subparagraph iii + Details
Name: | ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 5 -Subparagraph ii + Details
Name: | ecd_CompActuallyPaidVsNetIncomeTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 5 -Subparagraph i + Details
Name: | ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph vi + Details
Name: | ecd_MeasureName
Namespace Prefix: | ecd_
Data Type: | xbrli:normalizedStringItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph iii + Details
Name: | ecd_NonPeoNeoAvgCompActuallyPaidAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph ii + Details
Name: | ecd_NonPeoNeoAvgTotalCompAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph iv + Details
Name: | ecd_PeerGroupTotalShareholderRtnAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph iii + Details
Name: | ecd_PeoActuallyPaidCompAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph ii + Details
Name: | ecd_PeoTotalCompAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 1 + Details
Name: | ecd_PvpTable
Namespace Prefix: | ecd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 1 + Details
Name: | ecd_PvpTableTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 6 + Details
Name: | ecd_TabularListTableTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph iv + Details
Name: | ecd_TotalShareholderRtnAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-28 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482765/220-10-50-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 250 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483443/250-10-50-3 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 250 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483443/250-10-50-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480175/815-40-65-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 250 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483443/250-10-50-8 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 250 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483443/250-10-50-9 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 250 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483443/250-10-50-11 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 250 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483443/250-10-50-11 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 250 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483443/250-10-50-4 Reference 13: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480167/946-830-55-10 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section 45 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483581/946-220-45-7 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(9)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(1)(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1A Reference 20: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(ii)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1A Reference 21: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iii)(A)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1A Reference 22: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iv)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1A Reference 23: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1A Reference 24: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1B Reference 25: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(A)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1B Reference 26: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1B Reference 27: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iv)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1B Reference 28: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480097/470-10-S99-1B Reference 29: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 Reference 30: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 31: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 60B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482689/260-10-45-60B Reference 32: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-31 Reference 33: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 34: http://www.xbrl.org/2003/role/disclosureRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483499/205-20-50-7 Reference 35: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 36: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-1A Reference 37: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-1B Reference 38: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 39: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
Name: | us-gaap_NetIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ecd_MeasureAxis=1
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_MeasureAxis=2
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_MeasureAxis=3
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_MeasureAxis=4
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_MeasureAxis=5
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_MeasureAxis=6
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_MeasureAxis=7
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=mbwm_PEOYearEndFairValueOfEquityGrantedDuringYearThatRemainedUnvestedAsOfLastDayOfYearPEOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=mbwm_PEOChangeInFairValueFromLastDayOfPriorYearToLastDayOfYearOfUnvestedEquityAwardsForPEOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=mbwm_PEOVestingDateFairValueOfEquityAwardsGrantedDuringYearThatVestedDuringYearForPEOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=mbwm_PEOChangeInFairValueFromLastDayOfPriorYearToVestingDateOfUnvestedEquityAwardsThatVestedDuringYearForPEOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=mbwm_PEOFairValueAtLastDayOfPriorYearOfEquityAwardsForfeitedDuringYearForPEOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=mbwm_PEOValueOfDividendsOrOtherEarningsPaidOnStockOrOptionAwardsNotOtherwiseIncludedForPEOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=mbwm_PEOTotalInclusionOfEquityValuesForPEOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=mbwm_NEOAverageYearEndFairValueOfEquityGrantedDuringYearThatRemainedUnvestedAsOfLastDayOfYearForNonPEOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=mbwm_NEOAverageChangeInFairValueFromLastDayOfPriorYearToLastDayOfYearOfUnvestedEquityAwardsForNonPEOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=mbwm_NEOAverageVestingDateFairValueOfEquityAwardsGrantedDuringYearThatVestedDuringYearForNonPEOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=mbwm_NEOAverageChangeInFairValueFromLastDayOfPriorYearToVestingDateOfUnvestedEquityAwardsThatVestedDuringYearForNonPEOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=mbwm_NEOAverageFairValueAtLastDayOfPriorYearOfEquityAwardsForfeitedDuringYearForNonPEOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=mbwm_NEOAverageValueOfDividendsOrOtherEarningsPaidOnStockOrOptionAwardsNotOtherwiseIncludedForNonPEOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=mbwm_NEOTotalAverageInclusionOfEquityValuesForNonPEOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |