XML 35 R25.htm IDEA: XBRL DOCUMENT
v3.21.2

Note 5 - Deposits (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2021
Notes Tables |
Summary of Deposits and Percentage Change in Deposits [Table Text Block] |
|  | June 30, 2021 |  |  | December 31, 2020 |  |  | Percent Increase |
|  | Balance |  |  | % |  |  | Balance |  |  | % |  |  | (Decrease) |
Noninterest-bearing demand |  | $ | 1,620,829,000 |  |  |  | 44.1 | % |  | $ | 1,433,403,000 |  |  |  | 42.0 | % |  |  | 13.1 | %
Interest-bearing checking |  |  | 477,151,000 |  |  |  | 13.0 |  |  |  | 473,053,000 |  |  |  | 13.9 |  |  |  | 0.9 |
Money market |  |  | 725,681,000 |  |  |  | 19.8 |  |  |  | 611,912,000 |  |  |  | 17.9 |  |  |  | 18.6 |
Savings |  |  | 387,783,000 |  |  |  | 10.6 |  |  |  | 338,070,000 |  |  |  | 9.9 |  |  |  | 14.7 |
Time, under $100,000 |  |  | 142,531,000 |  |  |  | 3.9 |  |  |  | 165,548,000 |  |  |  | 4.9 |  |  |  | (13.9 | )
Time, $100,000 and over |  |  | 286,383,000 |  |  |  | 7.8 |  |  |  | 342,633,000 |  |  |  | 10.0 |  |  |  | (16.4 | )
Total local deposits |  |  | 3,640,358,000 |  |  |  | 99.2 |  |  |  | 3,364,619,000 |  |  |  | 98.6 |  |  |  | 8.2 |
Out-of-area time, $100,000 and over |  |  | 30,913,000 |  |  |  | 0.8 |  |  |  | 46,934,000 |  |  |  | 1.4 |  |  |  | (34.1 | )
Total deposits |  | $ | 3,671,271,000 |  |  |  | 100.0 | % |  | $ | 3,411,553,000 |  |  |  | 100.0 | % |  |  | 7.6 | %

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