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Basis of Presentation (Additional Information) (Details) (Other Borrowings, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Other Borrowings
 
Reclassification [Line Items]  
Debt issuance cost reclassified from other assets $ 550us-gaap_DeferredFinanceCostsGross
/ us-gaap_BalanceSheetLocationAxis
= htlf_OtherLongtermDebtMember