Investment Securities AFS and HTM Contractual Maturity Table (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Amortized Cost
Due in one year or less	$ 40,879
Due after one year through five years	233,433
Due after five years through ten years	234,102
Due after ten years	584
Total debt securities	508,998
Fair Value
Due in one year or less	41,115
Due after one year through five years	245,483
Due after five years through ten years	244,730
Due after ten years	609
Total debt securities	531,937
Investment securities available for sale, amortized cost	5,282,339	5,368,259
Investment securities available for sale, at fair value	5,358,310us-gaap_AvailableForSaleSecurities	5,396,812us-gaap_AvailableForSaleSecurities
Ratio of Fair Value to Amortized Cost	101.40%asb_RatioofFairValuetoAmortizedCostAFS
Amortized Cost
Due in one year or less	0
Due after one year through five years	2,253
Due after five years through ten years	122,372
Due after ten years	313,422
Amortized cost	438,047us-gaap_HeldToMaturitySecurities	404,455us-gaap_HeldToMaturitySecurities
Fair Value
Due in one year or less	0
Due after one year through five years	2,291
Due after five years through ten years	124,896
Due after ten years	319,510
Total debt securities	446,697	413,067
Ratio of Fair Value to Amortized Cost	102.00%asb_RatioOfFairValueToAmortizedCostHtm
Government-Sponsored Enterprise (GSE) [Member]
Fair Value
Investment securities available for sale, amortized cost	3,613,144	3,700,103
Investment securities available for sale, at fair value	3,675,114	3,730,789
Private Label [Member]
Fair Value
Investment securities available for sale, amortized cost	1,962	2,297
Investment securities available for sale, at fair value	1,953	2,294
GSE commercial mortgage-related securities [Member]
Fair Value
Investment securities available for sale, amortized cost	1,158,217	1,097,913
Investment securities available for sale, at fair value	1,149,256	1,073,893
Equity Securities [Member]
Fair Value
Investment securities available for sale, amortized cost	18
Investment securities available for sale, at fair value	$ 50

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