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Network
100740 - Disclosure - Goodwill and Other Intangible Assets - Summary of Core Deposit Intangible Assets Activity (Detail)
(http://www.investarbank.com/20161231/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsSummaryOfCoreDepositIntangibleAssetsActivityDetail)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001602658 (http://www.sec.gov/CIK)
Goodwill And Intangible Assets Disclosure [Abstract]Period [Axis]
2016-12-31
2015-12-31
Goodwill And Intangible Assets Disclosure [Abstract]
 
 
Gross carrying amount
617,000  
617,000  
Accumulated amortization
(167,000) 
(126,000) 
Net carrying amount
450,000  
 
491,000