XML 21 R107.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Repurchase Agreements - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Repurchase Agreements [Abstract] |  |
Maximum amount of outstanding agreements | $ 97.3 | $ 61.4
Daily average amount of outstanding agreements | $ 81.3 | $ 51.4

X
- Definition Securities sold under agreements to repurchase daily average outstanding. + References No definition available. + Details
Name: | hbnc_SecuritiesSoldUnderAgreementsToRepurchaseDailyAverageOutstanding
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Securities sold under agreements to repurchase monthly average outstanding amount. + References No definition available. + Details
Name: | hbnc_SecuritiesSoldUnderAgreementsToRepurchaseMonthlyAverageOutstandingAmount
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfRepurchaseAgreementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration