Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2023

Banking and Thrift, Other Disclosure [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 2023 or 2022.

	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 , 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	%
As of December 31 , 2022
Associated Banc-Corp
Total capital	$	3,680,227	11.33	%	$	2,597,589	≥	8.00	%
Tier 1 capital	3,229,690		9.95	%	1,948,192		≥	6.00	%
CET1	3,035,578		9.35	%	1,461,144		≥	4.50	%
Leverage	3,229,690		8.59	%	1,504,035		≥	4.00	%
Associated Bank, N.A.
Total capital	$	3,594,845	11.09	%	$	2,593,728	≥	8.00	%	$	3,242,160	≥	10.00	%
Tier 1 capital	3,243,349		10.00	%	1,945,296		≥	6.00	%	2,593,728		≥	8.00	%
CET1	3,243,349		10.00	%	1,458,972		≥	4.50	%	2,107,404		≥	6.50	%
Leverage	3,243,349		8.63	%	1,503,666		≥	4.00	%	1,879,583		≥	5.00	%

(a) Prompt corrective action provisions are not applicable at the bank holding company level.