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Securities (Other-than-temporary impairments) (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2012
securities
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]        
Gross realized gains (losses) on sale of available for sale securities with OTTI write-downs   $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet   $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
OTTI write-downs included in earnings, available for sale debt securities 184,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities 184,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities   184,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
Number of investments with OTTI 3htlf_OtherthanTemporaryImpairmentLossesInvestmentsPortionRecognizedinEarningsNumberofMortgagebackedSecurities      
OTTI write-downs included in earnings, held to maturity debt securities 797,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetHeldtomaturitySecurities      
Recorded as part of gross realized losses: Credit related OTTI   0htlf_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetCreditRelated 0htlf_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetCreditRelated  
Recorded as part of gross realized losses: Intent to sell OTTI   0htlf_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetIntentToSell 0htlf_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetIntentToSell  
Total recorded as part of gross realized losses 981,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet  
Recorded directly to AOCI for non-credit related impairment: Residential mortgage backed securities   0htlf_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestNonCreditRelated 0htlf_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestNonCreditRelated  
Recorded directly to AOCI for non-credit related impairment: Accretion of non-credit related impairment   (24,000)htlf_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAccretionOfNonCreditImpairment (24,000)htlf_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAccretionOfNonCreditImpairment  
Total changes to AOCI for non-credit related impairment   (24,000)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest (24,000)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest  
Total OTTI losses (accretion) recorded on debt securities, net   (24,000)us-gaap_ImpairmentOfInvestments (24,000)us-gaap_ImpairmentOfInvestments  
Held-to-maturity Securities        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Credit related OTTI   797,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_DebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
  797,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_DebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
Non-credit related OTTI   $ 398,000htlf_OtherThanTemporaryImpairmentNonCreditLossesRecognizedInEarningsLossesOnDebtSecuritiesHeld
/ us-gaap_DebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
  $ 422,000htlf_OtherThanTemporaryImpairmentNonCreditLossesRecognizedInEarningsLossesOnDebtSecuritiesHeld
/ us-gaap_DebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember