Description of Business, Basis of Presentation and Significant Accounting Policies and Recently Issued Accounting Pronouncements - Description of Business (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) branch investment tranch
Business Description and Basis of Presentation [Line Items]
Variable Interest Entity Number of Investments | investment	2
Heritage Bank
Business Description and Basis of Presentation [Line Items]
Number of branches operating | branch	62
Investment Tax Credit Carryforward [Member] | Subsidiaries [Member]
Business Description and Basis of Presentation [Line Items]
Qualified Equity Investments | $	$ 25.0
Number of Tranches | tranch	3
Tax Credit Carryforward, Required Funding Percentage	85.00%