| Component: (Network and Table) | |
|---|---|
| Network | 152 - Disclosure - Mortgage Servicing Rights (Details 1) (http://www.bankmutualcorp.com/role/MortgageServicingRightsDetails1) |
| Table | Mortgage Servicing Rights [Table] |
| Reporting Entity [Axis] | 0001123270 (http://www.sec.gov/CIK) |
| Statement, Scenario [Axis] | Scenario, Unspecified [Domain] |
| Finite-Lived Intangible Assets by Major Class [Axis] | Finite-Lived Intangible Assets, Major Class Name [Domain] |
| Finite-Lived Intangible Assets [Line Items] | Period [Axis] | |
|---|---|---|
2016-12-31 | 2015-12-31 | |
2017 | ||
2018 | ||
2019 | ||
2020 | ||
2021 | ||
Thereafter | ||
Total | 6,569,000 | 7,205,000 |