Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2016

Regulatory Capital Requirements [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations

	Actual				For Capital Adequacy Purposes					To Be Well Capitalized Under Prompt Corrective Action Provisions:(2)
	Amount		Ratio(1)		Amount		Ratio(1)			Amount		Ratio(1)
	($ in Thousands)
As of December 31 , 2016
Associated Banc-Corp
Total capital	$	2,706,760	12.68	%	$	1,707,276	≥	8.00	%
Tier 1 capital	2,191,798		10.27		1,280,457		≥	6.00	%
Common equity Tier 1 capital	2,032,587		9.52		960,343		≥	4.50	%
Leverage	2,191,798		7.83		1,119,685		≥	4.00	%
Associated Bank, N.A.
Total capital	$	2,565,062	12.07	%	$	1,700,737	≥	8.00	%	$	2,125,921	≥	10.00	%
Tier 1 capital	2,298,812		10.81		1,275,553		≥	6.00	%	1,700,737		≥	8.00	%
Common equity Tier 1 capital	2,098,812		9.87		956,664		≥	4.50	%	1,381,849		≥	6.50	%
Leverage	2,298,812		8.24		1,115,731		≥	4.00	%	1,394,663		≥	5.00	%
As of December 31 , 2015
Associated Banc-Corp
Total capital	$	2,515,861	12.62	%	$	1,594,397	≥	8.00	%
Tier 1 capital	2,016,861		10.12		1,195,798		≥	6.00	%
Common equity Tier 1 capital	1,897,944		9.52		896,848		≥	4.50	%
Leverage	2,016,861		7.60		1,061,325		≥	4.00	%
Associated Bank, N.A.
Total capital	$	2,532,563	12.76	%	$	1,588,070	≥	8.00	%	$	1,985,088	≥	10.00	%
Tier 1 capital	2,283,785		11.50		1,191,053		≥	6.00	%	1,588,070		≥	8.00	%
Common equity Tier 1 capital	2,084,589		10.50		893,289		≥	4.50	%	1,290,307		≥	6.50	%
Leverage	2,283,785		8.64		1,057,228		≥	4.00	%	1,321,535		≥	5.00	%

(1) When fully phased-in on January 1, 2019, the Basel III capital rules include a capital conservation buffer of 2.5% that is 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 will increase each subsequent January 1, until it reaches 2.5% on January 1, 2019.

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