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Loans and Leases (Loans and leases not covered by share agreements (credit quality indicator)) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable $ 4,244,966us-gaap_NotesReceivableGross $ 3,877,863us-gaap_NotesReceivableGross
Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 1,134,614us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 1,036,080us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 1,932,701us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember		 1,707,060us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Commercial and commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 3,067,315us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 2,743,140us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Agricultural and agricultural real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 411,732us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= htlf_AgriculturalPortfolioSegmentMember		 423,827us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= htlf_AgriculturalPortfolioSegmentMember
Residential real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 413,938us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 380,341us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 351,981us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 330,555us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 3,926,699us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 3,592,750us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 1,025,159us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 939,717us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass | Commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 1,774,036us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,567,711us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass | Commercial and commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 2,799,195us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 2,507,428us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass | Agricultural and agricultural real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 389,296us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= htlf_AgriculturalPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 402,883us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= htlf_AgriculturalPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass | Residential real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 394,534us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 361,325us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass | Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 343,674us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 321,114us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Nonpass    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 318,267us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember		 285,113us-gaap_NotesReceivableGross
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember
Nonpass | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 109,455us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember		 96,363us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember
Nonpass | Commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 158,665us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember		 139,349us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember
Nonpass | Commercial and commercial real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 268,120us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember		 235,712us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember
Nonpass | Agricultural and agricultural real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 22,436us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= htlf_AgriculturalPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember		 20,944us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= htlf_AgriculturalPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember
Nonpass | Residential real estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable 19,404us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember		 19,016us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember
Nonpass | Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases receivable $ 8,307us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember		 $ 9,441us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember