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Summary of Significant Accounting Policies - Narrative Details (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Accounting Policies [Abstract]
Goodwill	$ 0		$ 25,222
Impairment of goodwill	(25,222)	$ 0
Restricted cash included in receivables and other assets	173,594	$ 851	2,800
Cash margin	169,500
Residential loans receivable	39,400		41,200
Operating lease right-of-use asset	9,100		9,300
Operating lease liabilities	$ 9,700		$ 9,800
Residential mortgage loans, delinquency period	90 days

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Residential Mortgage Loans, Delinquency Period

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Amount of right to receive cash and securities on deposit with broker-dealers to demonstrate an intention to complete a purchase (good faith deposit) and collateral deposited by counterparty to cover the credit risk assumed (margin deposit).

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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