Loan Sales and Servicing Activities - Summary of Mortgage Servicing Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Mortgage servicing portfolio
Loans held for sale	$ 8,749,673	$ 4,724,006
Total loans serviced	401,896,800	368,684,232
Delinquent loans:
30 days	7,360,174	8,844,792
60 days	3,800,337	2,663,060
90 days or more - Not in foreclosure	29,947,899	4,345,074
90 days or more - In foreclosure	868,532	1,182,137
90 days or more - Foreclosed	62,334	107,736
Total delinquent mortgage loans	42,039,276	17,142,799
Bankruptcy	1,974,015	2,035,185
Delinquent loans in COVID-19 related forbearance
30 days	2,819,154
60 days	2,766,100
90 days or more not in foreclosure	22,544,078
Total delinquent loans in COVID-19 related forbearance	28,129,332
Custodial funds managed by the Company	16,712,414	8,942,275
Servicing rights owned
Mortgage servicing portfolio
Loans held for sale	8,749,673	4,724,006
Total loans serviced	245,400,232	233,269,564
Delinquent loans:
30 days	5,924,488	7,987,132
60 days	3,178,614	2,490,797
90 days or more - Not in foreclosure	24,324,945	4,070,482
90 days or more - In foreclosure	831,239	1,113,806
90 days or more - Foreclosed	16,409	18,315
Total delinquent mortgage loans	34,275,695	15,680,532
Bankruptcy	1,815,833	1,898,367
Delinquent loans in COVID-19 related forbearance
30 days	2,344,986
60 days	2,289,880
90 days or more not in foreclosure	17,827,122
Total delinquent loans in COVID-19 related forbearance	22,461,988
Custodial funds managed by the Company	10,364,855	6,412,291
Contract servicing and subservicing
Mortgage servicing portfolio
Total loans serviced	156,496,568	135,414,668
Delinquent loans:
30 days	1,435,686	857,660
60 days	621,723	172,263
90 days or more - Not in foreclosure	5,622,954	274,592
90 days or more - In foreclosure	37,293	68,331
90 days or more - Foreclosed	45,925	89,421
Total delinquent mortgage loans	7,763,581	1,462,267
Bankruptcy	158,182	136,818
Delinquent loans in COVID-19 related forbearance
30 days	474,168
60 days	476,220
90 days or more not in foreclosure	4,716,956
Total delinquent loans in COVID-19 related forbearance	5,667,344
Custodial funds managed by the Company	6,347,559	2,529,984
Non affiliated entities
Mortgage servicing portfolio
Originated	188,854,796	168,842,011
Purchased	47,795,763	59,703,547
Total loans serviced, excluding loans held for sale	236,650,559	228,545,558
Non affiliated entities | Servicing rights owned
Mortgage servicing portfolio
Originated	188,854,796	168,842,011
Purchased	47,795,763	59,703,547
Total loans serviced, excluding loans held for sale	236,650,559	228,545,558
Affiliated entities
Mortgage servicing portfolio
Advised entities	156,496,568	135,414,668
Affiliated entities | Contract servicing and subservicing
Mortgage servicing portfolio
Advised entities	$ 156,496,568	$ 135,414,668