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Redemption of Long-term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Debt Instrument [Line Items]            
Penalty on prepayment of debt $ 0   $ 2,210   $ 205 $ 2,539
Federal Home Loan Bank            
Debt Instrument [Line Items]            
Penalty on prepayment of debt     2,210 $ 329    
Prepayment of debt     $ 38,886 $ 3,483    
Subordinated notes | Heritage Financial Statutory Trust One            
Debt Instrument [Line Items]            
Aggregate amount of debt   $ 10,515        
Principal amount of debt   10,310        
Prepayment penalty   $ 205