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Loans and Leases (Loans and leases not covered by share agreements (in text)) (Details)
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Loans delinquent 30 to 89 days, percentage 0.42%htlf_FinancingReceivableRecordedInvestment30to89DaysPastDuePercentage 0.21%htlf_FinancingReceivableRecordedInvestment30to89DaysPastDuePercentage
Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Percent of loans (less than) 68.00%htlf_LoansAndLeasesReceivableGrossPercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 66.00%htlf_LoansAndLeasesReceivableGrossPercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Percent of loans (less than) 32.00%htlf_LoansAndLeasesReceivableGrossPercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 34.00%htlf_LoansAndLeasesReceivableGrossPercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Percent of loans (less than) 1.00%htlf_LoansAndLeasesReceivableGrossPercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		  
Nonpass    
Financing Receivable, Recorded Investment [Line Items]    
Percent of nonaccrual loans 8.00%htlf_FinancingReceivablesRecordedInvestmentsNonaccrualStatusPercentage
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember		 9.00%htlf_FinancingReceivablesRecordedInvestmentsNonaccrualStatusPercentage
/ us-gaap_InternalCreditAssessmentAxis
= htlf_NonpassMember