0000007789 2026-04-23 2026-04-23 0000007789 exch:XNYS 2026-04-23 2026-04-23 0000007789 us-gaap:SeriesEPreferredStockMember exch:XNYS 2026-04-23 2026-04-23 0000007789 us-gaap:SeriesFPreferredStockMember exch:XNYS 2026-04-23 2026-04-23 0000007789 asb:TwoThousandTwentyThreeSubordinatedDebtMember exch:XNYS 2026-04-23 2026-04-23 0000007789 false 8-K 2026-04-23 Associated Banc-Corp WI 001-31343 39-1098068 433 Main Street Green Bay WI 54301 920 491-7500 false false false false Common stock, par value $0.01 per share ASB NYSE Depositary Shrs, each representing 1/40th intrst in a shr of 5.875% Non-Cum. Perp Pref Stock, Srs E ASB PrE NYSE Depositary Shrs, each representing 1/40th intrst in a shr of 5.625% Non-Cum. Perp Pref Stock, Srs F ASB PrF NYSE 6.625% Fixed-Rate Reset Subordinated Notes due 2033 ASBA NYSE false 2026-04-23 2026-04-23 2026-04-23