Acquisitions (Details) - USD ($) $ in Thousands			12 Months Ended
	Aug. 31, 2021	Aug. 06, 2021	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Goodwill and intangible assets, acquisitions			$ 8,389	$ 350,136
Westpac Lenders Mortgage Insurance Limited
Business Acquisition [Line Items]
Term of business exclusivity agreement	10 years
Somerset
Business Acquisition [Line Items]
Goodwill and intangible assets, acquisitions		$ 350,100