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Regulatory Matters
 12 Months Ended
Dec. 31, 2020
Banking and Thrift, Other Disclosures [Abstract]  
Regulatory Matters Regulatory Matters
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 CET1 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, 2020 and 2019, 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, 2020 and 2019, 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 2020 or 2019.
 ActualFor Capital Adequacy
Purposes
To Be Well Capitalized
Under Prompt Corrective
Action Provisions(a)
($ in Thousands)Amount
Ratio(a)
Amount
Ratio
Amount    
Ratio
As of December 31 , 2020
Associated Banc-Corp
Total capital$3,632,807 14.02 %$2,072,273  ≥8.00 %
Tier 1 capital3,058,809 11.81 %1,554,205  ≥6.00 %
Common equity Tier 1 capital2,706,010 10.45 %1,165,654  ≥4.50 %
Leverage3,058,809 9.37 %1,305,604 ≥4.00 %
Associated Bank, N.A.
Total capital$3,295,823 12.74 %$2,068,801 ≥8.00 %$2,586,002 ≥10.00 %
Tier 1 capital2,971,234 11.49 %1,551,601  ≥6.00 %2,068,801 ≥8.00 %
Common equity Tier 1 capital2,971,234 11.49 %1,163,701  ≥4.50 %1,680,901 ≥6.50 %
Leverage2,971,234 9.11 %1,304,448 ≥4.00 %1,630,560 ≥5.00 %
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 %
(a) Prompt corrective action provisions are not applicable at the bank holding company level.