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Description of Business, Basis of Presentation and Significant Accounting Policies and Recently Issued Accounting Pronouncements (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
branch
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Item Effected [Line Items]          
Allowance for credit losses on loans $ 64,225 $ 70,185 $ 47,540   $ 36,171
Heritage Bank [Member]          
Item Effected [Line Items]          
Number of Branches Operating | branch 53        
Accounting Standards Update 2016-13 [Member]          
Item Effected [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption       $ 5,600  
Cumulative Effect Of New Accounting Principle In Period Of Adoption PreTax       7,100  
Unused Commitments to Extend Credit [Member]          
Item Effected [Line Items]          
Accounts Receivable, Allowance for Credit Loss $ 3,617 $ 4,681 $ 1,990   $ 306
Cumulative Effect of New Accounting Principle in Period of Adoption       3,700  
Unused Commitments to Extend Credit [Member] | Accounting Standards Update 2016-13 [Member]          
Item Effected [Line Items]          
Accounts Receivable, Allowance for Credit Loss       3,700  
Total Allowance for Credit Losses [Member]          
Item Effected [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption       $ 3,400