Mortgage Servicing Advances (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Servicing advances	$ 120.8	$ 130.6
Mortgage servicing rights, delinquency rate	1.00%	1.30%
Line of Credit [Member] | Asset Pledged as Collateral
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Servicing advances	$ 41.8	$ 33.8