TWO Quarterly report pursuant to Section 13 or 15(d)

Serviced Mortgage Assets (Details) $ in Thousands	Sep. 30, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans \| loan	802,223	783,579
Unpaid Principal Balance \| $	$ 194,983,450	$ 178,928,983
Mortgage servicing rights
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans \| loan	801,239	781,905
Unpaid Principal Balance \| $	$ 194,393,942	$ 177,861,483
Residential mortgage loans
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans \| loan	982	1,674
Unpaid Principal Balance \| $	$ 589,465	$ 1,067,500
Other assets
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans \| loan	2	0
Unpaid Principal Balance \| $	$ 43	$ 0