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Summary of Significant Accounting Policies - Narrative Details (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Real Estate Properties [Line Items]
Impairment of goodwill	$ 0	$ (25,222)
Restricted cash included in other assets	29,654	$ 173,594
Residential loans receivable	65,500		$ 63,600
Operating lease right-of-use asset	9,900		10,100
Operating lease liabilities	10,300		10,600
Other Assets
Real Estate Properties [Line Items]
Restricted cash included in other assets	29,700		11,300
Operating real estate	$ 82,100		$ 50,500

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Amount of loss from the write-down of an asset representing the 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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