XML 63 R45.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Note 14 - Derivatives and Hedging Activities (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Notes Tables |
Schedule of Derivative Instruments [Table Text Block] |
(Dollars in thousands) |  | Notional Amount |  | Balance Sheet Location |  | Fair Value |
Derivative Assets |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 676,526 |  | Other Assets |  | $ | 27,505 |
Derivative Liabilities |  |  |  |  |  |  |  |  |
Interest rate swaps |  |  | 674,499 |  | Other Liabilities |  |  | 27,964 |
(Dollars in thousands) |  | Notional Amount |  | Balance Sheet Location |  | Fair Value |
Derivative Assets |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 401,572 |  | Other Assets |  | $ | 26,173 |
Derivative Liabilities |  |  |  |  |  |  |  |  |
Interest rate swaps |  |  | 401,572 |  | Other Liabilities |  |  | 26,377 |
Offsetting Assets and Liabilities [Table Text Block] |
|  |  |  |  | Gross Amounts Not Offset on the Consolidated Balance Sheet |
(Dollars in thousands) |  | Net Amounts Recognized |  |  | Financial Instruments |  |  | Cash Collateral Received or posted |  |  | Net Amount |
Derivative Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 27,505 |  |  | $ | 5,175 |  |  | $ | 14,010 |  |  | $ | 8,320 |
Derivative Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  |  | 27,964 |  |  | $ | 5,175 |  |  |  | 3,120 |  |  | $ | 19,669 |
|  |  |  |  | Gross Amounts Not Offset on the Consolidated Balance Sheet |
(Dollars in thousands) |  | Net Amounts Recognized |  |  | Financial Instruments |  |  | Cash Collateral Received or posted |  |  | Net Amount |
Derivative Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 26,173 |  |  | $ | 415 |  |  | $ | 24,760 |  |  | $ | 998 |
Derivative Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  |  | 26,377 |  |  | $ | 415 |  |  |  | 0 |  |  | $ | 25,962 |

X
- Definition Tabular disclosure of derivative and other financial assets and liabilities that are subject to offsetting, including master netting arrangements. + References No definition available. + Details
Name: | mbwm_OffsettingAssetsAndLiabilitiesTableTextBlock
Namespace Prefix: | mbwm_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-8 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-5 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C + Details
Name: | us-gaap_ScheduleOfDerivativeInstrumentsTextBlock
Namespace Prefix: | us-gaap_
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