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Derivative Financial Instruments (Derivative instruments gains and losses recognized (not designated as hedging instruments)) (Details) (Net Gains on Sale of Loans Held for Sale, USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Interest rate lock commitments
    
Trading Activity, Gains and Losses, Net [Line Items]    
Year-to-Date Gain (Loss) Recognized $ 5,544us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_IncomeStatementLocationAxis
= htlf_GainOnSaleOfLoansHeldForSaleMember		 $ 1,882us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_IncomeStatementLocationAxis
= htlf_GainOnSaleOfLoansHeldForSaleMember
Forward commitments
    
Trading Activity, Gains and Losses, Net [Line Items]    
Year-to-Date Gain (Loss) Recognized $ (125)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_IncomeStatementLocationAxis
= htlf_GainOnSaleOfLoansHeldForSaleMember		 $ (1,142)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_IncomeStatementLocationAxis
= htlf_GainOnSaleOfLoansHeldForSaleMember