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Description of Business, Basis of Presentation and Significant Accounting Policies and Recently Issued Accounting Pronouncements (Details)
$ in Millions
Oct. 29, 2021
Branch
Nov. 08, 2021
branch
Sep. 30, 2021
branch
Jan. 01, 2020
USD ($)
Subsequent Event        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of Branches Consolidated | Branch 4      
Heritage Bank        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of Branches Operating | branch     53  
Heritage Bank | Subsequent Event        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of Branches Operating | branch   49    
Accounting Standards Update 2016-13        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption       $ 5.6
Cumulative Effect Of New Accounting Principle In Period Of Adoption PreTax       7.1
Total Allowance for Credit Losses        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption       3.4
Unused Commitments to Extend Credit        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption       $ 3.7