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Loans and Leases (Troubled debt restructurings on financing receivables) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
loans
Mar. 31, 2014
loans
Financing Receivable, Modifications [Line Items]    
Number of Loans 1htlf_FinancingReceivableModificationsNumberOfContractsModifiedInPeriod 1htlf_FinancingReceivableModificationsNumberOfContractsModifiedInPeriod
Pre- Modification Recorded Investment $ 3,992htlf_FinancingReceivableModificationsPreModificationRecordedInvestmentsModifiedInPeriod $ 368htlf_FinancingReceivableModificationsPreModificationRecordedInvestmentsModifiedInPeriod
Post- Modification Recorded Investment 3,992htlf_FinancingReceivableModificationsPostModificationRecordedInvestmentsModifiedInPeriod 368htlf_FinancingReceivableModificationsPostModificationRecordedInvestmentsModifiedInPeriod
Commercial    
Financing Receivable, Modifications [Line Items]    
Number of Loans 0htlf_FinancingReceivableModificationsNumberOfContractsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 0htlf_FinancingReceivableModificationsNumberOfContractsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Pre- Modification Recorded Investment 0htlf_FinancingReceivableModificationsPreModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 0htlf_FinancingReceivableModificationsPreModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Post- Modification Recorded Investment 0htlf_FinancingReceivableModificationsPostModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 0htlf_FinancingReceivableModificationsPostModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Commercial real estate    
Financing Receivable, Modifications [Line Items]    
Number of Loans 1htlf_FinancingReceivableModificationsNumberOfContractsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember		 1htlf_FinancingReceivableModificationsNumberOfContractsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Pre- Modification Recorded Investment 3,992htlf_FinancingReceivableModificationsPreModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember		 368htlf_FinancingReceivableModificationsPreModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Post- Modification Recorded Investment 3,992htlf_FinancingReceivableModificationsPostModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember		 368htlf_FinancingReceivableModificationsPostModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Commercial and commercial real estate    
Financing Receivable, Modifications [Line Items]    
Number of Loans 1htlf_FinancingReceivableModificationsNumberOfContractsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 1htlf_FinancingReceivableModificationsNumberOfContractsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Pre- Modification Recorded Investment 3,992htlf_FinancingReceivableModificationsPreModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 368htlf_FinancingReceivableModificationsPreModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Post- Modification Recorded Investment 3,992htlf_FinancingReceivableModificationsPostModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 368htlf_FinancingReceivableModificationsPostModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Agricultural and agricultural real estate    
Financing Receivable, Modifications [Line Items]    
Number of Loans 0htlf_FinancingReceivableModificationsNumberOfContractsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= htlf_AgriculturalPortfolioSegmentMember		 0htlf_FinancingReceivableModificationsNumberOfContractsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= htlf_AgriculturalPortfolioSegmentMember
Pre- Modification Recorded Investment 0htlf_FinancingReceivableModificationsPreModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= htlf_AgriculturalPortfolioSegmentMember		 0htlf_FinancingReceivableModificationsPreModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= htlf_AgriculturalPortfolioSegmentMember
Post- Modification Recorded Investment 0htlf_FinancingReceivableModificationsPostModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= htlf_AgriculturalPortfolioSegmentMember		 0htlf_FinancingReceivableModificationsPostModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= htlf_AgriculturalPortfolioSegmentMember
Residential real estate    
Financing Receivable, Modifications [Line Items]    
Number of Loans 0htlf_FinancingReceivableModificationsNumberOfContractsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 0htlf_FinancingReceivableModificationsNumberOfContractsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Pre- Modification Recorded Investment 0htlf_FinancingReceivableModificationsPreModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 0htlf_FinancingReceivableModificationsPreModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Post- Modification Recorded Investment 0htlf_FinancingReceivableModificationsPostModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 0htlf_FinancingReceivableModificationsPostModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Consumer    
Financing Receivable, Modifications [Line Items]    
Number of Loans 0htlf_FinancingReceivableModificationsNumberOfContractsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 0htlf_FinancingReceivableModificationsNumberOfContractsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Pre- Modification Recorded Investment 0htlf_FinancingReceivableModificationsPreModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 0htlf_FinancingReceivableModificationsPreModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Post- Modification Recorded Investment $ 0htlf_FinancingReceivableModificationsPostModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 $ 0htlf_FinancingReceivableModificationsPostModificationRecordedInvestmentsModifiedInPeriod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember