Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
INTEREST INCOME
Interest and fees on loans	$ 151,945	$ 143,387
Interest and dividends on investment securities
Taxable	25,092us-gaap_InterestIncomeSecuritiesTaxable	26,257us-gaap_InterestIncomeSecuritiesTaxable
Tax exempt	7,887	6,971
Other interest	1,692us-gaap_OtherInterestAndDividendIncome	1,449us-gaap_OtherInterestAndDividendIncome
Total interest income	186,616	178,064
INTEREST EXPENSE
Interest on deposits	7,619us-gaap_InterestExpenseDeposits	6,159us-gaap_InterestExpenseDeposits
Interest on Federal funds purchased and securities sold under agreements to repurchase	231	305
Interest on other short-term funding	81	116
Interest on long-term funding	10,872us-gaap_InterestExpenseLongTermDebt	6,511us-gaap_InterestExpenseLongTermDebt
Total interest expense	18,803us-gaap_InterestExpense	13,091us-gaap_InterestExpense
NET INTEREST INCOME	167,813us-gaap_InterestIncomeExpenseNet	164,973us-gaap_InterestIncomeExpenseNet
Provision for credit losses	4,500	5,000
Net interest income after provision for credit losses	163,313	159,973
NONINTEREST INCOME
Trust service fees	12,087	11,711
Service charges on deposit accounts	15,806	16,400
Card-based and other nondeposit fees	12,416asb_CardBasedAndOtherNondepositFees	12,509asb_CardBasedAndOtherNondepositFees
Insurance commissions	19,728us-gaap_InsuranceCommissionsAndFees	12,317us-gaap_InsuranceCommissionsAndFees
Brokerage and annuity commissions	3,683us-gaap_BrokerageCommissionsRevenue	4,033us-gaap_BrokerageCommissionsRevenue
Mortgage banking, net	7,408	6,361
Capital market fees, net	2,467asb_CapitalMarketFeesNet	2,322asb_CapitalMarketFeesNet
Bank owned life insurance income	2,875us-gaap_BankOwnedLifeInsuranceIncome	4,320us-gaap_BankOwnedLifeInsuranceIncome
Asset gains, net	1,096us-gaap_GainsLossesOnSalesOfAssets	728us-gaap_GainsLossesOnSalesOfAssets
Investment securities gains, net	0us-gaap_MarketableSecuritiesGainLoss	378us-gaap_MarketableSecuritiesGainLoss
Other	2,510	2,442
Total noninterest income	80,076us-gaap_NoninterestIncome	73,521us-gaap_NoninterestIncome
NONINTEREST EXPENSE
Personnel expense	100,152us-gaap_LaborAndRelatedExpense	97,698us-gaap_LaborAndRelatedExpense
Occupancy	17,683us-gaap_OccupancyNet	15,560us-gaap_OccupancyNet
Equipment	5,772us-gaap_EquipmentExpense	6,276us-gaap_EquipmentExpense
Technology	15,558	12,724
Business development and advertising	5,327us-gaap_MarketingAndAdvertisingExpense	5,062us-gaap_MarketingAndAdvertisingExpense
Other intangible amortization	801us-gaap_AmortizationOfIntangibleAssets	991us-gaap_AmortizationOfIntangibleAssets
Loan expense	2,996asb_LoanExpense	2,787asb_LoanExpense
Legal and professional fees	4,538us-gaap_ProfessionalFees	4,188us-gaap_ProfessionalFees
Foreclosure / OREO expense	1,425us-gaap_ForeclosedRealEstateExpense	1,896us-gaap_ForeclosedRealEstateExpense
FDIC expense	6,500	5,001
Other	13,503us-gaap_OtherNoninterestExpense	15,475us-gaap_OtherNoninterestExpense
Total noninterest expense	174,255us-gaap_NoninterestExpense	167,658us-gaap_NoninterestExpense
Income before income taxes	69,134	65,836
Income tax expense	22,462us-gaap_IncomeTaxExpenseBenefit	20,637us-gaap_IncomeTaxExpenseBenefit
Net income	46,672us-gaap_NetIncomeLoss	45,199us-gaap_NetIncomeLoss
Preferred stock dividends	1,228	1,244
Net income available to common equity	$ 45,444	$ 43,955
Earnings per common share:
Basic (in usd per share)	$ 0.30us-gaap_EarningsPerShareBasic	$ 0.27us-gaap_EarningsPerShareBasic
Diluted (in usd per share)	$ 0.30us-gaap_EarningsPerShareDiluted	$ 0.27us-gaap_EarningsPerShareDiluted
Average common shares outstanding:
Basic (in shares)	150,070	161,467
Diluted (in shares)	151,164	162,188

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