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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2019
Banking and Thrift [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations The actual capital amounts and ratios of the Corporation and its significant subsidiary are presented below. No deductions from capital were made for interest rate risk in 2019 or 2018.
 ActualFor Capital Adequacy
Purposes
To Be Well Capitalized
Under Prompt Corrective
Action Provisions(b)
($ in Thousands)Amount
Ratio(a)
Amount
Ratio(a)
Amount    
Ratio(a)    
As of December 31 , 2019
Associated Banc-Corp
Total capital$3,208,625  13.21 %$1,943,711   ≥8.00 %
Tier 1 capital2,736,776  11.26 %1,457,783   ≥6.00 %
Common equity Tier 1 capital2,480,698  10.21 %1,093,337   ≥4.50 %
Leverage2,736,776  8.83 %1,239,431  ≥4.00 %
Associated Bank, N.A.
Total capital$2,892,650  11.95 %$1,936,732  ≥8.00 %$2,420,915  ≥10.00 %
Tier 1 capital2,669,372  11.03 %1,452,549   ≥6.00 %1,936,732  ≥8.00 %
Common equity Tier 1 capital2,469,578  10.20 %1,089,412   ≥4.50 %1,573,595  ≥6.50 %
Leverage2,669,372  8.63 %1,236,565  ≥4.00 %1,545,706  ≥5.00 %
As of December 31 , 2018
Associated Banc-Corp
Total capital$3,216,575  13.49 %$1,907,403  ≥8.00 %
Tier 1 capital2,705,939  11.35 %1,430,553   ≥6.00 %
Common equity Tier 1 capital2,449,721  10.27 %1,072,914   ≥4.50 %
Leverage2,705,939  8.49 %1,275,048   ≥4.00 %
Associated Bank, N.A.
Total capital$2,909,064  12.25 %$1,900,536  ≥8.00 %$2,375,671  ≥10.00 %
Tier 1 capital2,646,705  11.14 %1,425,402  ≥6.00 %1,900,536  ≥8.00 %
Common equity Tier 1 capital2,446,782  10.30 %1,069,052   ≥4.50 %1,544,186  ≥6.50 %
Leverage2,646,705  8.32 %1,272,804   ≥4.00 %1,591,006  ≥5.00 %
(a) When fully phased-in on January 1, 2019, the Basel III capital rules included a capital conservation buffer of 2.5% that was added on top of each of the minimum risk-based capital ratios noted above. Implementation began on January 1, 2016 at the 0.625% level and has increased each subsequent January 1, until it reached 2.5% on January 1, 2019.
(b) Prompt corrective action provisions are not applicable at the bank holding company level.