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Debt Securities - Purchased Credit Impaired Debt Securities (Details) - Colony NorthStar - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Outstanding principal	$ 213,929	$ 411,174
Amortized cost	2,757	26,761
Carrying value	3,619	31,789
PCI Debt Securities Acquired During Period
Contractually required payments including interest			$ 574,088
Less: Nonaccretable difference			(449,261)
Cash flows expected to be collected			124,827
Less: Accretable yield			(70,283)
Fair value of PCI debt securities acquired			$ 54,544
Accretable Yield Movement Schedule [Roll Forward]
Beginning accretable yield	44,610	0
Assumed through the Merger	0	70,283
Accretion recognized in earnings	(3,489)	(12,461)
Reduction due to payoffs, disposals or deconsolidation	(17,081)	(8,963)
Net reclassifications to nonaccretable difference (1)	(24,040)	(4,249)
Ending accretable yield	$ 0	$ 44,610

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Certain Loans Acquired In Transfer Accounted For As Available For Sale Debt Securities Amortized Cost

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The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans accounted for as available-for-sale debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Fair value at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

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