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Description of Business, Basis of Presentation and Significant Accounting Policies and Recently Issued Accounting Pronouncements - Recently Issued Accounting Pronouncements (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
bank
Jun. 30, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [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
Heritage Bank [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of Branches Operating | bank 62      
Accounting Standards Update 2016-13 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for credit losses on loans     1,800  
Purchase Credit Impaired Loans [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Allowance for credit losses on loans     $ 1,600  
UNITED STATES        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Debt Securities, Available-for-sale, Issuance Percent       83.50%
State and Local Jurisdiction        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Debt Securities, Available-for-sale, Issuance Percent       14.00%