XML 35 R62.htm IDEA: XBRL DOCUMENT v2.4.1.9
Goodwill, Core Deposit Premium and Other Intangible Assets (Mortgage loans servicing) (Details) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Jan. 16, 2015
Valuation servicing rights in tranches [Line Items]        
Mortgage loans serviced for others $ 3,580,000,000htlf_MortgageLoansServicedForOthersAmount   $ 3,500,000,000htlf_MortgageLoansServicedForOthersAmount  
Valuation allowance 0us-gaap_ServicingAssetAtAmortizedValueValuationAllowance      
Mortgage Servicing Rights        
Valuation servicing rights in tranches [Line Items]        
Servicing asset at amortized value 34,492,000us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= htlf_MortgageServicingRightsMember
32,032,000us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= htlf_MortgageServicingRightsMember
34,200,000us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= htlf_MortgageServicingRightsMember
 
Prepayment rate 11.66%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FinancialInstrumentAxis
= htlf_MortgageServicingRightsMember
  11.40%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FinancialInstrumentAxis
= htlf_MortgageServicingRightsMember
 
Discount rate 9.21%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FinancialInstrumentAxis
= htlf_MortgageServicingRightsMember
  9.20%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FinancialInstrumentAxis
= htlf_MortgageServicingRightsMember
 
Fees collected for servicing of mortgage loans 2,500,000us-gaap_FeesAndCommissionsMortgageBankingAndServicing
/ us-gaap_FinancialInstrumentAxis
= htlf_MortgageServicingRightsMember
2,100,000us-gaap_FeesAndCommissionsMortgageBankingAndServicing
/ us-gaap_FinancialInstrumentAxis
= htlf_MortgageServicingRightsMember
   
Mortgage Servicing Rights | Minimum        
Valuation servicing rights in tranches [Line Items]        
Average cap rate 0.75%us-gaap_FairValueInputsCapRate
/ us-gaap_FinancialInstrumentAxis
= htlf_MortgageServicingRightsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
  0.75%us-gaap_FairValueInputsCapRate
/ us-gaap_FinancialInstrumentAxis
= htlf_MortgageServicingRightsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Mortgage Servicing Rights | Maximum        
Valuation servicing rights in tranches [Line Items]        
Average cap rate 1.30%us-gaap_FairValueInputsCapRate
/ us-gaap_FinancialInstrumentAxis
= htlf_MortgageServicingRightsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
  1.39%us-gaap_FairValueInputsCapRate
/ us-gaap_FinancialInstrumentAxis
= htlf_MortgageServicingRightsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Mortgage Servicing Rights 15-year Tranche        
Valuation servicing rights in tranches [Line Items]        
Servicing asset, agreement term 15 years      
Mortgage Servicing Rights 30-year Tranche        
Valuation servicing rights in tranches [Line Items]        
Servicing asset, agreement term 30 years      
Commercial Servicing Rights        
Valuation servicing rights in tranches [Line Items]        
Servicing asset at amortized value 4,400,000us-gaap_ServicingAssetAtAmortizedValueFairValue
/ us-gaap_FinancialInstrumentAxis
= htlf_CommercialServicingRightsMember
     
Fees collected for servicing of mortgage loans       149,000us-gaap_FeesAndCommissionsMortgageBankingAndServicing
/ us-gaap_FinancialInstrumentAxis
= htlf_CommercialServicingRightsMember
Loans serviced for Small Business Administration and US Department of Agriculture       $ 145,100,000us-gaap_ServicingAsset
/ us-gaap_FinancialInstrumentAxis
= htlf_CommercialServicingRightsMember