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Fair Value Measurements (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]      
Fair value assets transfers between level 1 and level 2 transfer amount $ 0hfwa_FairValueAssetsTransfersBetweenLevel1andLevel2TransfersAmount $ 0hfwa_FairValueAssetsTransfersBetweenLevel1andLevel2TransfersAmount $ 0hfwa_FairValueAssetsTransfersBetweenLevel1andLevel2TransfersAmount