Description of Business, Basis of Presentation and Significant Accounting Policies and Recently Issued Accounting Pronouncements - Description of Business (Details) $ in Thousands	Mar. 31, 2020 USD ($) bank
Business Description and Basis of Presentation [Line Items]
Financing Receivable, Allowance for Credit Loss | $	$ 47,540
Heritage Bank
Business Description and Basis of Presentation [Line Items]
Number of branches operating | bank	62