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Regulatory Matters | 12 Months Ended
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Dec. 31, 2024
Banking and Thrift, Other Disclosure [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 to risk-weighted assets, and of tier 1 capital to average assets. Management believes, as of December 31, 2024 and 2023, 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, 2024 and 2023, 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 2024 or 2023.
| Actual | For Capital Adequacy Purposes | To Be Well-Capitalized Under Prompt Corrective Action Provisions(a)
($ in thousands) | Amount | Ratio | Amount | Ratio | Amount | Ratio
As of December 31 , 2024 |  |  |  |  |  |  |  |
Associated Banc-Corp |  |  |  |  |  |  |  |
Total capital | $ | 4,282,597 |  | 12.61 | % | $ | 2,716,014 |  | ≥ | 8.00 | % |  |  |
Tier 1 capital | 3,590,948 |  | 10.58 | % | 2,037,010 |  | ≥ | 6.00 | % |  |  |
CET1 | 3,396,836 |  | 10.01 | % | 1,527,758 |  | ≥ | 4.50 | % |  |  |
Leverage | 3,590,948 |  | 8.73 | % | 1,644,627 |  | ≥ | 4.00 | % |  |  |
Associated Bank, N.A. |  |  |  |  |  |  |  |
Total capital | $ | 4,078,042 |  | 12.03 | % | $ | 2,710,815 |  | ≥ | 8.00 | % | $ | 3,388,519 |  | ≥ | 10.00 | %
Tier 1 capital | 3,425,721 |  | 10.11 | % | 2,033,111 |  | ≥ | 6.00 | % | 2,710,815 |  | ≥ | 8.00 | %
CET1 | 3,425,721 |  | 10.11 | % | 1,524,833 |  | ≥ | 4.50 | % | 2,202,537 |  | ≥ | 6.50 | %
Leverage | 3,425,721 |  | 8.34 | % | 1,642,484 |  | ≥ | 4.00 | % | 2,053,105 |  | ≥ | 5.00 | %
As of December 31 , 2023 |  |  |  |  |  |  |  |
Associated Banc-Corp |  |  |  |  |  |  |  |
Total capital | $ | 3,997,205 |  | 12.21 | % | $ | 2,618,596 |  | ≥ | 8.00 | % |  |  |
Tier 1 capital | 3,269,050 |  | 9.99 | % | 1,963,947 |  | ≥ | 6.00 | % |  |  |
CET1 | 3,074,938 |  | 9.39 | % | 1,472,960 |  | ≥ | 4.50 | % |  |  |
Leverage | 3,269,050 |  | 8.06 | % | 1,622,053 |  | ≥ | 4.00 | % |  |  |
Associated Bank, N.A. |  |  |  |  |  |  |  |
Total capital | $ | 3,803,052 |  | 11.64 | % | $ | 2,614,469 |  | ≥ | 8.00 | % | $ | 3,268,086 |  | ≥ | 10.00 | %
Tier 1 capital | 3,167,182 |  | 9.69 | % | 1,960,852 |  | ≥ | 6.00 | % | 2,614,469 |  | ≥ | 8.00 | %
CET1 | 3,167,182 |  | 9.69 | % | 1,470,639 |  | ≥ | 4.50 | % | 2,124,256 |  | ≥ | 6.50 | %
Leverage | 3,167,182 |  | 7.82 | % | 1,620,970 |  | ≥ | 4.00 | % | 2,026,212 |  | ≥ | 5.00 | %
(a) Prompt corrective action provisions are not applicable at the bank holding company level.

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- Definition The entire disclosure for regulatory capital requirement for depository and lending institutions. Institutions include, but not are not limited to, finance company, insured depository institution, bank holding company, savings and loan association holding company, bank and savings institution not federally insured, mortgage company, foreign financial institution and credit union. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1D Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1F + Details
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