Subsequent Events (Details) $ in Millions	May 18, 2018 USD ($)
Subsequent Events [Abstract]
Total assets of entity that was to be acquired	$ 411.0
Estimate of aggregate consideration upon acquisition	$ 76.7

Identifiable Assets and Liabilities Under Proposed Merger, Asset, Total

No definition available.

Name:	hafc_IdentifiableAssetsandLiabilitiesUnderProposedMergerAssetTotal
Namespace Prefix:	hafc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant