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Regulatory Matters (Tables)
12 Months Ended
Dec. 31, 2021
Banking and Thrift, Other Disclosures [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 2021 or 2020.
 ActualFor 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 , 2021
Associated Banc-Corp
Total capital$3,570,026 13.10 %$2,179,419  ≥8.00 %
Tier 1 capital3,001,074 11.02 %1,634,564  ≥6.00 %
CET12,808,289 10.31 %1,225,923  ≥4.50 %
Leverage3,001,074 8.83 %1,359,299 4.00 %
Associated Bank, N.A.
Total capital$3,243,672 11.93 %$2,175,689 8.00 %$2,719,611 10.00 %
Tier 1 capital2,923,881 10.75 %1,631,766  ≥6.00 %2,175,689 8.00 %
CET12,923,881 10.75 %1,223,825  ≥4.50 %1,767,747 6.50 %
Leverage2,923,881 8.61 %1,358,041 4.00 %1,697,551 5.00 %
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 %
CET12,706,010 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 %
CET12,971,234 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 %
(a) Prompt corrective action provisions are not applicable at the bank holding company level.