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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Pay vs Performance Disclosure [Table]      
Pay vs Performance [Table Text Block] This section also contains graphical disclosures of the pay versus performance relationship based on the information in the Pay Versus Performance Table.
Value of Initial Fixed $100 Investment Based On:
YearSummary Compensation Table Total for PEO (Harmening)
Compensation Actually Paid to PEO (Harmening)
1,6
Summary Compensation Table Total for PEO (Flynn)
Compensation Actually Paid to PEO (Flynn)1,6
Average Summary Compensation Table Total for Non-PEO NEOs
Average Compensation Actually Paid to Non-PEO NEOs1,6
Total Shareholder Return2
Peer Group Total Shareholder Return (KBW Nasdaq Regional Banking Total Return Index)3
Net Income4
Operating Leverage5
2022$6,066,586 $6,445,013 N/AN/A$1,603,303 $1,653,420 $117.92 $116.10 $366,122 11.9 %
2021$11,330,092 $11,317,941 $3,393,524 $4,998,727 $1,393,032 $1,608,777 $111.27 $124.74 $350,994 3.5 %
2020N/AN/A$4,160,306 $1,895,528 $1,043,338 $608,069 $81.07 $91.29 $306,771 -6.2 %
    
Named Executive Officers, Footnote [Text Block] Amounts represent compensation actually paid (“CAP”) to our principal executive officers, or “PEOs”, and the average compensation actually paid to our remaining NEOs for the relevant fiscal year, as determined under SEC rules (and described below), which includes the individuals indicated in the table below for each fiscal year:
Year
PEO(s)
Non-PEO NEOs
2022
Andrew J. Harmening
Derek S. Meyer, Christopher J. Del Moral-Niles, John A. Utz, Randall J. Erickson, David L. Stein
2021
Andrew J. Harmening and Philip B. Flynn
Christopher J. Del Moral-Niles, John A. Utz, Randall J. Erickson, David L. Stein
2020
Philip B. Flynn
Christopher J. Del Moral-Niles, John A. Utz, Randall J. Erickson, David L. Stein
    
Peer Group Issuers, Footnote [Text Block] For the relevant fiscal year, represents the cumulative TSR of the KBW Nasdaq Regional Banking Total Return Index (^KRXTR). The KRXTR is comprised of approximately 50 publicly traded regional banks or thrifts listed on U.S. stock markets. This index was determined by management to represent the nearest equivalent to the KBW Nasdaq Regional Banking Index (^KRX) used for purposes of the Total Shareholder Return Performance Graph in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022. The KRX is not suitable for determining peer group TSR in accordance with the regulations applicable to the pay versus performance disclosure in this section.    
PEO Total Compensation Amount $ 6,066,586 $ 11,330,092 $ 4,160,306
PEO Actually Paid Compensation Amount $ 6,445,013 11,317,941 1,895,528
Adjustment To PEO Compensation, Footnote [Text Block] CAP to our NEOs represents the “Total” compensation reported in the Summary Compensation Table for the applicable fiscal year, adjusted as follows:
202220212020
AdjustmentsPEO: Andrew J. HarmeningAverage non-PEO NEOsPEO: Andrew J. HarmeningPEO: Philip B. FlynnAverage non-PEO NEOsPEO: Philip B. FlynnAverage non-PEO NEOs
As Reported Summary Compensation Table Total$6,066,586$1,603,303$11,330,092$3,393,524$1,393,032$4,160,306$1,043,338
(-) Grant Date Fair Value of Stock Awards Granted in FY$2,499,973$538,188$9,174,980$678,117$522,981$2,624,973$522,975
(+) Awards granted in CFY that are outstanding and unvested as of end of CFY$2,306,902$554,732$7,214,058$640,950$494,315$1,881,061$380,281
(+) Awards that are granted and vest in the same CFY$0$0$1,948,770$0$0$503,956$103,236
(+) Prior year awards outstanding and unvested as of end of CFY$655,113$225,292$0$240,590$213,615$-1,954,199$-362,670
(+) Prior year awards that vest in CFY$-151,049$38,030$0$1,262,342$50,105$-329,480$-68,831
(-) Prior year awards that fail to meet vesting conditions during CFY$0$242,235$0$0$33,991$0$0
(+) Dividends or other earnings paid on all awards in CFY prior to vesting date$69,237$15,410$0$142,270$17,669$262,311$39,549
(-) Change in Pension Value and Non-Qualified Deferred Compensation Earnings$4,575$6,552$0$10,864$11,535$11,320$11,936
(+) Pension Adjustment$2,772$3,628$0$8,033$8,548$7,867$8,078
= Compensation Actually Paid$6,445,013$1,653,420$11,317,941$4,998,727$1,608,777$1,895,528$608,069
FY = Fiscal Year
CFY = Covered Fiscal Year
    
Non-PEO NEO Average Total Compensation Amount $ 1,603,303 1,393,032 1,043,338
Non-PEO NEO Average Compensation Actually Paid Amount $ 1,653,420 1,608,777 608,069
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] CAP to our NEOs represents the “Total” compensation reported in the Summary Compensation Table for the applicable fiscal year, adjusted as follows:
202220212020
AdjustmentsPEO: Andrew J. HarmeningAverage non-PEO NEOsPEO: Andrew J. HarmeningPEO: Philip B. FlynnAverage non-PEO NEOsPEO: Philip B. FlynnAverage non-PEO NEOs
As Reported Summary Compensation Table Total$6,066,586$1,603,303$11,330,092$3,393,524$1,393,032$4,160,306$1,043,338
(-) Grant Date Fair Value of Stock Awards Granted in FY$2,499,973$538,188$9,174,980$678,117$522,981$2,624,973$522,975
(+) Awards granted in CFY that are outstanding and unvested as of end of CFY$2,306,902$554,732$7,214,058$640,950$494,315$1,881,061$380,281
(+) Awards that are granted and vest in the same CFY$0$0$1,948,770$0$0$503,956$103,236
(+) Prior year awards outstanding and unvested as of end of CFY$655,113$225,292$0$240,590$213,615$-1,954,199$-362,670
(+) Prior year awards that vest in CFY$-151,049$38,030$0$1,262,342$50,105$-329,480$-68,831
(-) Prior year awards that fail to meet vesting conditions during CFY$0$242,235$0$0$33,991$0$0
(+) Dividends or other earnings paid on all awards in CFY prior to vesting date$69,237$15,410$0$142,270$17,669$262,311$39,549
(-) Change in Pension Value and Non-Qualified Deferred Compensation Earnings$4,575$6,552$0$10,864$11,535$11,320$11,936
(+) Pension Adjustment$2,772$3,628$0$8,033$8,548$7,867$8,078
= Compensation Actually Paid$6,445,013$1,653,420$11,317,941$4,998,727$1,608,777$1,895,528$608,069
FY = Fiscal Year
CFY = Covered Fiscal Year
    
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
TSR amounts reported in the graph assume an initial fixed investment of $100, and that all dividends, if any, were reinvested.
asb-20230310_g24.jpg
    
Compensation Actually Paid vs. Net Income [Text Block]
The following graph compares (i) compensation actually paid to our PEOs and the average compensation actually paid to our other NEOs to (ii) our net income, for the fiscal years ended December 31, 2020, 2021 and 2022.


asb-20230310_g25.jpg
    
Compensation Actually Paid vs. Company Selected Measure [Text Block]
The following graph compares (i) compensation actually paid to our PEOs and the average compensation actually paid to our other NEOs to (ii) our adjusted operating leverage, for the fiscal years ended December 31, 2020, 2021 and 2022.


asb-20230310_g26.jpg

(1) Operating leverage is calculated by taking the year over year percentage change in Total Revenue Before Long-Term Credit Charge minus the percentage change in Total noninterest expense. A positive ratio shows that revenue is growing faster than expenses. Whereas a negative ratio indicates that expenses are accumulating faster than revenue. The 2021 and 2020 ratios have been adjusted to exclude the $163 million pre-tax gain on sale of ABRC.
    
Tabular List [Table Text Block]
Company-selected performance measures
Operating leverage
Revenue (growth)
Net Income After Tax
ROATCE
EPS
Efficiency Ratio
    
Total Shareholder Return Amount $ 117.92 111.27 81.07
Peer Group Total Shareholder Return Amount 116.10 124.74 91.29
Net Income (Loss) $ 366,122,000 $ 350,994,000 $ 306,771,000
Company Selected Measure Amount 0.119 0.035 (0.062)
PEO Name Andrew J. Harmening Andrew J. Harmening and Philip B. Flynn Philip B. Flynn
Measure [Axis]: 1      
Pay vs Performance Disclosure [Table]      
Measure Name Operating leverage    
Non-GAAP Measure Description [Text Block] Operating leverage is calculated by taking the year over year percentage change in Total Revenue Before Long-Term Credit Charge minus the percentage change in Total noninterest expense. A positive ratio shows that revenue is growing faster than expenses. Whereas a negative ratio indicates that expenses are accumulating faster than revenue. The 2021 and 2020 ratios have been adjusted to exclude the $163 million pre-tax gain on sale of ABRC.    
Measure [Axis]: 2      
Pay vs Performance Disclosure [Table]      
Measure Name Revenue (growth)    
Measure [Axis]: 3      
Pay vs Performance Disclosure [Table]      
Measure Name Net Income After Tax    
Measure [Axis]: 4      
Pay vs Performance Disclosure [Table]      
Measure Name ROATCE    
Measure [Axis]: 5      
Pay vs Performance Disclosure [Table]      
Measure Name EPS    
Measure [Axis]: 6      
Pay vs Performance Disclosure [Table]      
Measure Name Efficiency Ratio    
Adjustment, Deductions for Various Reasons [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   $ 163,000,000 $ 163,000,000
Flynn [Member]      
Pay vs Performance Disclosure [Table]      
PEO Total Compensation Amount   3,393,524 4,160,306
PEO Actually Paid Compensation Amount   4,998,727 1,895,528
Harmening [Member]      
Pay vs Performance Disclosure [Table]      
PEO Total Compensation Amount   11,330,092  
PEO Actually Paid Compensation Amount   11,317,941  
PEO [Member] | Grant Date Fair Value of Stock Awards Granted in FY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ 2,499,973   2,624,973
PEO [Member] | Awards granted in CFY that are outstanding and unvested as of end of CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 2,306,902   1,881,061
PEO [Member] | Awards that are granted and vest in the same CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0   503,956
PEO [Member] | Prior year awards outstanding and unvested as of end of CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 655,113   (1,954,199)
PEO [Member] | Prior year awards that vest in CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (151,049)   (329,480)
PEO [Member] | Prior year awards that fail to meet vesting conditions during CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0   0
PEO [Member] | Dividends or other earnings paid on all awards in CFY prior to vesting date [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 69,237   262,311
PEO [Member] | Change in Pension Value and Non-Qualified Deferred Compensation Earnings [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 4,575   11,320
PEO [Member] | Pension Adjustment [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 2,772   7,867
PEO [Member] | Flynn [Member] | Grant Date Fair Value of Stock Awards Granted in FY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   678,117  
PEO [Member] | Flynn [Member] | Awards granted in CFY that are outstanding and unvested as of end of CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   640,950  
PEO [Member] | Flynn [Member] | Awards that are granted and vest in the same CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   0  
PEO [Member] | Flynn [Member] | Prior year awards outstanding and unvested as of end of CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   240,590  
PEO [Member] | Flynn [Member] | Prior year awards that vest in CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   1,262,342  
PEO [Member] | Flynn [Member] | Prior year awards that fail to meet vesting conditions during CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   0  
PEO [Member] | Flynn [Member] | Dividends or other earnings paid on all awards in CFY prior to vesting date [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   142,270  
PEO [Member] | Flynn [Member] | Change in Pension Value and Non-Qualified Deferred Compensation Earnings [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   10,864  
PEO [Member] | Flynn [Member] | Pension Adjustment [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   8,033  
PEO [Member] | Harmening [Member] | Grant Date Fair Value of Stock Awards Granted in FY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   9,174,980  
PEO [Member] | Harmening [Member] | Awards granted in CFY that are outstanding and unvested as of end of CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   7,214,058  
PEO [Member] | Harmening [Member] | Awards that are granted and vest in the same CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   1,948,770  
PEO [Member] | Harmening [Member] | Prior year awards outstanding and unvested as of end of CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   0  
PEO [Member] | Harmening [Member] | Prior year awards that vest in CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   0  
PEO [Member] | Harmening [Member] | Prior year awards that fail to meet vesting conditions during CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   0  
PEO [Member] | Harmening [Member] | Dividends or other earnings paid on all awards in CFY prior to vesting date [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   0  
PEO [Member] | Harmening [Member] | Change in Pension Value and Non-Qualified Deferred Compensation Earnings [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   0  
PEO [Member] | Harmening [Member] | Pension Adjustment [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   0  
Non-PEO NEO [Member] | Grant Date Fair Value of Stock Awards Granted in FY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 538,188 522,981 522,975
Non-PEO NEO [Member] | Awards granted in CFY that are outstanding and unvested as of end of CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 554,732 494,315 380,281
Non-PEO NEO [Member] | Awards that are granted and vest in the same CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 103,236
Non-PEO NEO [Member] | Prior year awards outstanding and unvested as of end of CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 225,292 213,615 (362,670)
Non-PEO NEO [Member] | Prior year awards that vest in CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 38,030 50,105 (68,831)
Non-PEO NEO [Member] | Prior year awards that fail to meet vesting conditions during CFY [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 242,235 33,991 0
Non-PEO NEO [Member] | Dividends or other earnings paid on all awards in CFY prior to vesting date [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 15,410 17,669 39,549
Non-PEO NEO [Member] | Change in Pension Value and Non-Qualified Deferred Compensation Earnings [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 6,552 11,535 11,936
Non-PEO NEO [Member] | Pension Adjustment [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ 3,628 $ 8,548 $ 8,078