XML 37 R28.htm IDEA: XBRL DOCUMENT
v3.23.3

Note 5 - Deposits (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2023
Notes Tables |
Summary of Deposits and Percentage Change in Deposits [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Percent |
|  | September 30, 2023 |  |  | December 31, 2022 |  |  | Increase |
|  | Balance |  |  | % |  |  | Balance |  |  | % |  |  | (Decrease) |
Noninterest-bearing checking |  | $ | 1,309,672,000 |  |  |  | 33.6 | % |  | $ | 1,604,750,000 |  |  |  | 43.2 | % |  |  | (18.4 | )%
Interest-bearing checking |  |  | 670,843,000 |  |  |  | 17.2 |  |  |  | 575,028,000 |  |  |  | 15.5 |  |  |  | 16.7 |
Money market |  |  | 976,348,000 |  |  |  | 25.0 |  |  |  | 776,723,000 |  |  |  | 20.9 |  |  |  | 25.7 |
Savings |  |  | 286,868,000 |  |  |  | 7.4 |  |  |  | 381,602,000 |  |  |  | 10.3 |  |  |  | (24.8 | )
Time, under $100,000 |  |  | 155,511,000 |  |  |  | 4.0 |  |  |  | 113,099,000 |  |  |  | 3.0 |  |  |  | 37.5 |
Time, $100,000 and over |  |  | 390,213,000 |  |  |  | 10.0 |  |  |  | 261,609,000 |  |  |  | 7.1 |  |  |  | 49.2 |
Total local deposits |  |  | 3,789,455,000 |  |  |  | 97.2 |  |  |  | 3,712,811,000 |  |  |  | 100.0 |  |  |  | 2.1 |
Out-of-area time, $100,000 and over |  |  | 111,280,000 |  |  |  | 2.8 |  |  |  | 0 |  |  |  | 0.0 |  |  |  | N/A |
Total deposits |  | $ | 3,900,735,000 |  |  |  | 100.0 | % |  | $ | 3,712,811,000 |  |  |  | 100.0 | % |  |  | 5.1 | %

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