XML 37 R27.htm IDEA: XBRL DOCUMENT
v3.21.1

Note 7 - Federal Home Loan Bank of Indianapolis Advances (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2021
Notes Tables |
Maturities of Currently Outstanding FHLB Advances [Table Text Block] |
2021 |  | $ | 20,000,000 |
2022 |  |  | 94,000,000 |
2023 |  |  | 80,000,000 |
2024 |  |  | 80,000,000 |
2025 |  |  | 50,000,000 |
Thereafter |  |  | 70,000,000 |

X
- Definition Tabular disclosure of the maturities of currently outstanding Federal Home Loan Bank advances. + References No definition available. + Details
Name: | mbwm_MaturitiesOfCurrentlyOutstandingFhlbAdvancesTableTextBlock
Namespace Prefix: | mbwm_
Data Type: | nonnum: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