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Cash and Due from Banks (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Abstract]
Reserve balance requirement	$ 15.2	$ 10.7

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- Definition

Reserve Requirement, Federal Reserve Bank

+ References

No definition available.

+ Details

Name:	htlf_ReserveRequirementFederalReserveBank
Namespace Prefix:	htlf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration