XML 54 R41.htm IDEA: XBRL DOCUMENT
v3.22.4

Note 9 - Federal Home Loan Bank of Indianapolis Advances (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Amortizing Advances [Member] |
Notes Tables |
Maturities of Currently Outstanding FHLB Advances [Table Text Block] |
2023 |  | $ | 353,000 |
2024 |  |  | 826,000 |
2025 |  |  | 862,000 |
2026 |  |  | 899,000 |
2027 |  |  | 938,000 |
Thereafter |  |  | 24,385,000 |
Bullet Advances [member] |
Notes Tables |
Maturities of Currently Outstanding FHLB Advances [Table Text Block] |
2023 |  | $ | 80,000,000 |
2024 |  |  | 80,000,000 |
2025 |  |  | 50,000,000 |
2026 |  |  | 30,000,000 |
2027 |  |  | 40,000,000 |

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: | 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

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mbwm_AmortizingAdvancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mbwm_BulletAdvancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |