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Consolidated Statements of Income (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues      
Premiums earned $ 375,747us-gaap_PremiumsEarnedNet $ 329,983us-gaap_PremiumsEarnedNet $ 290,689us-gaap_PremiumsEarnedNet
Net investment income 27,214us-gaap_NetInvestmentIncome 27,029us-gaap_NetInvestmentIncome 27,018us-gaap_NetInvestmentIncome
Net realized gains (losses) on investments 697us-gaap_MarketableSecuritiesRealizedGainLoss (1,211)us-gaap_MarketableSecuritiesRealizedGainLoss 2,979us-gaap_MarketableSecuritiesRealizedGainLoss
Fee and other income 361us-gaap_OtherIncome 534us-gaap_OtherIncome 562us-gaap_OtherIncome
Total revenues 404,019us-gaap_Revenues 356,335us-gaap_Revenues 321,248us-gaap_Revenues
Expenses      
Loss and loss adjustment expenses incurred 244,916us-gaap_PolicyholderBenefitsAndClaimsIncurredNet 228,973us-gaap_PolicyholderBenefitsAndClaimsIncurredNet 219,903us-gaap_PolicyholderBenefitsAndClaimsIncurredNet
Underwriting and certain other operating costs 32,573amsf_UnderwritingAndCertainOtherOperatingCosts 18,951amsf_UnderwritingAndCertainOtherOperatingCosts 18,450amsf_UnderwritingAndCertainOtherOperatingCosts
Commissions 27,872us-gaap_InsuranceCommissions 25,303us-gaap_InsuranceCommissions 22,144us-gaap_InsuranceCommissions
Salaries and benefits 24,518us-gaap_LaborAndRelatedExpense 22,862us-gaap_LaborAndRelatedExpense 20,839us-gaap_LaborAndRelatedExpense
Interest expense     566us-gaap_InterestExpense
Policyholder dividends 391us-gaap_PolicyholderDividends 1,042us-gaap_PolicyholderDividends 2,203us-gaap_PolicyholderDividends
Total expenses 330,270us-gaap_BenefitsLossesAndExpenses 297,131us-gaap_BenefitsLossesAndExpenses 284,105us-gaap_BenefitsLossesAndExpenses
Income before income taxes 73,749us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 59,204us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 37,143us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense 20,083us-gaap_IncomeTaxExpenseBenefit 15,567us-gaap_IncomeTaxExpenseBenefit 7,790us-gaap_IncomeTaxExpenseBenefit
Net income 53,666us-gaap_NetIncomeLoss 43,637us-gaap_NetIncomeLoss 29,353us-gaap_NetIncomeLoss
Net income available to common shareholders $ 53,666us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 43,495us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 29,331us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Earnings per share      
Basic $ 2.88us-gaap_EarningsPerShareBasic $ 2.37us-gaap_EarningsPerShareBasic $ 1.62us-gaap_EarningsPerShareBasic
Diluted $ 2.84us-gaap_EarningsPerShareDiluted $ 2.32us-gaap_EarningsPerShareDiluted $ 1.58us-gaap_EarningsPerShareDiluted
Shares used in computing earnings per share      
Basic 18,646,128us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 18,373,033us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 18,166,261us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 18,928,504us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 18,748,809us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 18,575,191us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Extraordinary cash dividends declared per common share $ 1.50amsf_SpecialCashDividendDeclaredPerShare $ 0.00amsf_SpecialCashDividendDeclaredPerShare  
Cash dividends declared per common share $ 0.48us-gaap_CommonStockDividendsPerShareDeclared $ 0.32us-gaap_CommonStockDividendsPerShareDeclared