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Investment securities HTM Securities Amortized Cost and Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Investment securities held to maturity:    
Investment securities held to maturity at amortized cost $ 404,455us-gaap_HeldToMaturitySecurities $ 175,210us-gaap_HeldToMaturitySecurities
Investment securities held to maturity, gross unrealized gains 9,444asb_Heldtomaturitysecuritiesaccumulatedunrecognizedholdinggain 401asb_Heldtomaturitysecuritiesaccumulatedunrecognizedholdinggain
Investment securities held to maturity, gross unrealized losses (832)asb_Heldtomaturitysecuritiesaccumulatedunrecognizedholdingloss 5,722asb_Heldtomaturitysecuritiesaccumulatedunrecognizedholdingloss
Investment securities held to maturity, fair value 413,067us-gaap_HeldToMaturitySecuritiesFairValue 169,889us-gaap_HeldToMaturitySecuritiesFairValue
Obligations of state and political subdivisions (municipal securities) [Member]    
Investment securities held to maturity:    
Investment securities held to maturity at amortized cost 404,455us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 175,210us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment securities held to maturity, gross unrealized gains 9,444asb_Heldtomaturitysecuritiesaccumulatedunrecognizedholdinggain
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 401asb_Heldtomaturitysecuritiesaccumulatedunrecognizedholdinggain
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment securities held to maturity, gross unrealized losses (832)asb_Heldtomaturitysecuritiesaccumulatedunrecognizedholdingloss
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 5,722asb_Heldtomaturitysecuritiesaccumulatedunrecognizedholdingloss
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment securities held to maturity, fair value $ 413,067us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 $ 169,889us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember