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Other Investments - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended			2 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Jan. 31, 2019	May 31, 2018	Feb. 28, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Commitment to fund partnership							$ 66,000
Commitment to fund partnership, funded amount					$ 6,000		6,000
Servicing asset, fair value					236,632		236,632		$ 286,778
Equity method investment earnings					3,000		5,000
Investment fair value changes, net					3,138	$ 889	23,297	$ 2,498
Interest income					148,542	82,976	279,583	159,595
Equity investment loss					96	0	5	0
Other income, net					2,407	3,322	5,994	5,440
Light-Renovation Multifamily Loans
Investment [Line Items]
Commitment to fund partnership		$ 78,000
Commitment to fund partnership, funded amount					29,000		29,000
Equity method investments, carrying value					29,000		29,000
Equity investment loss					100
5 Arches, LLC
Investment [Line Items]
Equity method investment earnings				$ 300
Payments to acquire equity method investment			$ 10,000
Option to purchase additional equity, term			1 year
Option to purchase additional equity, amount			$ 40,000
Option to purchase additional equity, percent	80.00%
Amortization of certain intangibles				$ 100
MSRs
Investment [Line Items]
Servicing asset, fair value	$ 55,284				47,396	$ 64,674	47,396	64,674	60,281	$ 66,496	$ 63,598
Servicing asset					4,830,000		4,830,000		4,930,000
Servicer advance financing
Investment [Line Items]
Collateral amounts					237,000		237,000
Investment fair value changes, net					400		1,000
Residential Loans
Investment [Line Items]
Servicing asset, fair value					259,222		259,222		300,468
Servicing asset, unpaid principal balance on underlying loan					8,340,000		8,340,000
Excess MSRs
Investment [Line Items]
Servicing asset, fair value					33,620		33,620		$ 27,312
Investment fair value changes, net					(100)			$ (500)
Interest income					$ 2,000		$ 4,000
5 Arches, LLC
Investment [Line Items]
Minority interest, percentage			20.00%

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