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Derivative Financial Instruments (Derivative Instruments Gains and Losses Recognized (Not Designated as Hedging Instruments)) (Details) (Gain on Sale of Loans Held for Sale, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Interest Rate Lock Commitments
   
Trading Activity, Gains and Losses, Net [Line Items]    
Year-to-Date Gain (Loss) Recognized $ 2,422us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_IncomeStatementLocationAxis
= htlf_GainOnSaleOfLoansHeldForSaleMember
$ (10,518)us-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 $ (2,417)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_IncomeStatementLocationAxis
= htlf_GainOnSaleOfLoansHeldForSaleMember
$ 1,832us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_IncomeStatementLocationAxis
= htlf_GainOnSaleOfLoansHeldForSaleMember