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Real Estate Securities - Gross Realized Gains and Losses on Sales and Calls of Available for Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Debt Securities, Available-for-sale [Line Items]
Total Realized Gains on Sales and Calls of AFS Securities, net	$ 7,275	$ 1,734	$ 21,352	$ 9,561
Sales
Debt Securities, Available-for-sale [Line Items]
Gross realized gains	7,275	1,734	21,312	9,381
Gross realized losses	0	0	(3)	0
Calls
Debt Securities, Available-for-sale [Line Items]
Gross realized gains	0	0	43	677
Gross realized losses	$ 0	$ 0	$ 0	$ (497)

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- Definition

Available-for-sale Securities, Gross Realized Gain (Loss) On Sales And Calls

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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