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Regulatory Matters
 12 Months Ended
Dec. 31, 2019
Banking and Thrift [Abstract]  
Regulatory Matters Regulatory Matters
Restrictions on Cash and Due From Banks
The Corporation’s bank subsidiary is required to maintain certain vault cash and reserve balances with the Federal Reserve Bank to meet specific reserve requirements. These requirements approximated $189 million at December 31, 2019.
Regulatory Capital Requirements
The Corporation and its subsidiary bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possible additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Corporation’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Corporation must meet specific capital guidelines that involve quantitative measures of the Corporation’s assets, liabilities, and certain off-
balance sheet items as calculated under regulatory accounting practices. The Corporation’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.
Quantitative measures established by regulation to ensure capital adequacy require the Corporation to maintain minimum amounts and ratios (set forth in the table below) of total and Common equity Tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined), and of Tier 1 capital (as defined) to average assets (as defined). Management believes, as of December 31, 2019 and 2018, that the Corporation meets all capital adequacy requirements to which it is subject.
For additional information on the capital requirements applicable for the Corporation and the Bank, please see Part I, Item 1.
As of December 31, 2019 and 2018, the most recent notifications from the OCC and the FDIC categorized the subsidiary bank as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, the subsidiary bank must maintain minimum ratios as set forth in the table. There are no conditions or events since that notification that management believes have changed the institution’s category. 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.