XML 36 R27.htm IDEA: XBRL DOCUMENT
v3.23.1

Note 5 - Deposits (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2023
Notes Tables |
Summary of Deposits and Percentage Change in Deposits [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Percent |
|  | March 31, 2023 |  |  | December 31, 2022 |  |  | Increase |
|  | Balance |  |  | % |  |  | Balance |  |  | % |  |  | (Decrease) |
Noninterest-bearing checking |  | $ | 1,376,782,000 |  |  |  | 38.3 | % |  | $ | 1,604,750,000 |  |  |  | 43.2 | % |  |  | (14.2 | %)
Interest-bearing checking |  |  | 576,678,000 |  |  |  | 16.0 |  |  |  | 575,028,000 |  |  |  | 15.5 |  |  |  | 0.3 |
Money market |  |  | 842,557,000 |  |  |  | 23.4 |  |  |  | 776,723,000 |  |  |  | 20.9 |  |  |  | 8.5 |
Savings |  |  | 340,178,000 |  |  |  | 9.5 |  |  |  | 381,602,000 |  |  |  | 10.3 |  |  |  | (10.9 | )
Time, under $100,000 |  |  | 132,482,000 |  |  |  | 3.7 |  |  |  | 113,099,000 |  |  |  | 3.0 |  |  |  | 17.1 |
Time, $100,000 and over |  |  | 329,341,000 |  |  |  | 9.1 |  |  |  | 261,609,000 |  |  |  | 7.1 |  |  |  | 25.9 |
Total deposits |  | $ | 3,598,018,000 |  |  |  | 100.0 | % |  | $ | 3,712,811,000 |  |  |  | 100.0 | % |  |  | (3.1 | %)

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