| Component: (Network and Table) | |
|---|---|
| Network | 2410406 - Disclosure - Retirement Plans, Weighted Average Assumptions used to Determine Benefit and Net Periodic Benefit Costs (Details) (http://www.associatedbank.com/role/RetirementPlansWeightedAverageAssumptionsUsedToDetermineBenefitAndNetPeriodicBenefitCostsDetails) |
| Table | Schedule of Defined Benefit Plans Disclosures [Table] |
| Reporting Entity [Axis] | 0000007789 (http://www.sec.gov/CIK) |
| Defined Benefit Plan Disclosure [Line Items] | Period [Axis] | |||||
|---|---|---|---|---|---|---|
2016-01-01 - 2016-12-31 | 2015-01-01 - 2015-12-31 | |||||
| Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] | Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] | |||||
| Retirement Account Plan | Postretirement Plan | Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] | Retirement Account Plan | Postretirement Plan | Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] | |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] | ||||||
Discount rate | ||||||
Rate of increase in compensation levels | ||||||
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] | ||||||
Discount rate | ||||||
Rate of increase in compensation levels | ||||||
Expected long-term rate of return on plan assets | ||||||