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Repurchase Agreements - Outstanding Repurchase Agreement Borrowings by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding repurchase agreements	$ 713,364	$ 2,352,102
CMBS
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold pending settlement	199,200
Outstanding repurchase agreements	380,137	811,890
Within 30 days
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding repurchase agreements	562,919	449,474
Over 30 days to 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding repurchase agreements	150,445	1,647,683
Over 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding repurchase agreements	$ 0	$ 254,945

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Securities Sold under Agreements to Repurchase, Pending Settlement

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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