XML 57 R39.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Note 6 - Deposits (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Notes Tables |
Summary of Deposits and Percentage Change in Deposits [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Percent |
(Dollars in thousands) |  | December 31, 2024 |  |  | December 31, 2023 |  |  | Increase |
|  | Balance |  |  | % |  |  | Balance |  |  | % |  |  | (Decrease) |
Noninterest-bearing checking |  | $ | 1,264,523 |  |  |  | 26.9 | % |  | $ | 1,247,640 |  |  |  | 32.1 | % |  |  | 1.4 | %
Interest-bearing checking |  |  | 738,291 |  |  |  | 15.7 |  |  |  | 635,790 |  |  |  | 16.3 |  |  |  | 16.1 |
Money market |  |  | 1,516,436 |  |  |  | 32.3 |  |  |  | 957,434 |  |  |  | 24.5 |  |  |  | 58.4 |
Savings |  |  | 221,900 |  |  |  | 4.7 |  |  |  | 262,566 |  |  |  | 6.7 |  |  |  | (15.5 | )
Time, under $100,000 |  |  | 207,534 |  |  |  | 4.4 |  |  |  | 175,741 |  |  |  | 4.5 |  |  |  | 18.1 |
Time, $100,000 and over |  |  | 599,983 |  |  |  | 12.8 |  |  |  | 453,366 |  |  |  | 11.6 |  |  |  | 32.3 |
Total local deposits |  |  | 4,548,667 |  |  |  | 96.8 |  |  |  | 3,732,537 |  |  |  | 95.7 |  |  |  | 21.9 |
Out-of-area time, $100,000 and over |  |  | 149,699 |  |  |  | 3.2 |  |  |  | 168,381 |  |  |  | 4.3 |  |  |  | (11.1 | )
Total deposits |  | $ | 4,698,366 |  |  |  | 100.0 | % |  | $ | 3,900,918 |  |  |  | 100.0 | % |  |  | 20.4 | %
Contractual Maturities of Certificates of Deposits [Table Text Block] |
(Dollars in thousands) |  | 2024 |  |  | 2023 |
In one year or less |  | $ | 880,165 |  |  | $ | 657,307 |
In one to two years |  |  | 53,660 |  |  |  | 61,454 |
In two to three years |  |  | 14,315 |  |  |  | 22,830 |
In three to four years |  |  | 2,301 |  |  |  | 54,486 |
In four to five years |  |  | 6,775 |  |  |  | 1,411 |
Total certificates of deposit |  | $ | 957,216 |  |  | $ | 797,488 |
Contractual Maturities of Certificates of Deposits of More than Specified Amount [Table Text Block] |
(Dollars in thousands) |  | 2024 |  |  | 2023 |
Up to three months |  | $ | 218,666 |  |  | $ | 167,535 |
Three months to six months |  |  | 185,327 |  |  |  | 127,344 |
Six months to twelve months |  |  | 291,179 |  |  |  | 210,915 |
Over twelve months |  |  | 54,510 |  |  |  | 115,953 |
Total certificates of deposit |  | $ | 749,682 |  |  | $ | 621,747 |

X
- Definition Tabular disclosure of the contractual maturities of certificates of deposits of more than specified amount. + References No definition available. + Details
Name: | mbwm_ContractualMaturitiesOfCertificatesOfDepositsOfMoreThanSpecifiedAmountTableTextBlock
Namespace Prefix: | mbwm_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the maturity distribution for certificates of deposit at year-end. + References No definition available. + Details
Name: | mbwm_ContractualMaturitiesOfCertificatesOfDepositsTableTextBlock
Namespace Prefix: | mbwm_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of deposits and the percentage change in deposits. + References No definition available. + Details
Name: | mbwm_SummaryOfDepositsAndPercentageChangeInDepositsTableTextBlock
Namespace Prefix: | mbwm_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration