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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 |

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