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Description of Business, Basis of Presentation and Significant Accounting Policies and Recently Issued Accounting Pronouncements - Description of Business (Details)
$ in Thousands
Jan. 31, 2021
bank
Oct. 31, 2020
bank
Sep. 30, 2020
USD ($)
bank
Jun. 30, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jan. 01, 2019
USD ($)
Business Description and Basis of Presentation [Line Items]                
Allowance for credit losses on loans     $ 73,340 $ 71,501 $ 37,993      
Accumulated Credit Losses, Increase (Decrease), Percentage to Loans Receivable         1.01% 0.96%    
Financing Receivable, Purchase, Discount (Premium)         $ 10,000 $ 8,400    
Financing Receivable, Purchase, Discount (Premium) CECL Day 1 Balance         4,300      
Cumulative Effect of New Accounting Principle in Period of Adoption         (5,615)     $ (399)
Purchase Credit Impaired Loans [Member]                
Business Description and Basis of Presentation [Line Items]                
Allowance for credit losses on loans         1,600      
Total Allowance for Credit Losses [Member]                
Business Description and Basis of Presentation [Line Items]                
Cumulative Effect of New Accounting Principle in Period of Adoption         3,400      
Unused Commitments to Extend Credit [Member]                
Business Description and Basis of Presentation [Line Items]                
Cumulative Effect of New Accounting Principle in Period of Adoption       $ 0 3,702   $ 0 $ 0
Accounting Standards Update 2016-13 [Member]                
Business Description and Basis of Presentation [Line Items]                
Allowance for credit losses on loans         1,800      
Financing Receivable, Purchase, Discount (Premium) CECL Day 1 Change         1,600      
Cumulative Effect Of New Accounting Principle In Period Of Adoption PreTax         7,100      
Cumulative Effect of New Accounting Principle in Period of Adoption         $ 5,600      
Heritage Bank                
Business Description and Basis of Presentation [Line Items]                
Number of branches operating | bank     62          
Heritage Bank | Forecast [Member]                
Business Description and Basis of Presentation [Line Items]                
Number of branches operating consolidated | bank   9            
Heritage Bank | Subsequent Event                
Business Description and Basis of Presentation [Line Items]                
Number of branches operating | bank   53            
Number of branches operating consolidated | bank 8 1