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Investment Securities Available for Sale - Schedule of Available for Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 1,593,054	$ 1,534,389
Unrealized Gains	13,085	17,989
Unrealized Losses	(22,174)	(40,126)
Fair Value	1,583,965	1,512,252
Agency ARMs
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	71,166	73,949
Unrealized Gains	6	8
Unrealized Losses	(2,310)	(2,563)
Fair Value	$ 68,862	71,394
Weighted average reset period	29 months
Agency ARMs | Freddie Mac
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 26,053	26,338
Unrealized Gains	0	0
Unrealized Losses	(981)	(1,052)
Fair Value	25,072	25,286
Agency ARMs | Fannie Mae
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	41,673	43,984
Unrealized Gains	6	8
Unrealized Losses	(1,196)	(1,384)
Fair Value	40,483	42,608
Agency ARMs | Ginnie Mae
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	3,440	3,627
Unrealized Gains	0	0
Unrealized Losses	(133)	(127)
Fair Value	3,307	3,500
Agency Fixed- Rate
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	974,252	1,002,057
Unrealized Gains	273	0
Unrealized Losses	(19,449)	(35,721)
Fair Value	955,076	966,336
Agency Fixed- Rate | Freddie Mac
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	85,182	87,018
Unrealized Gains	0	0
Unrealized Losses	(1,041)	(2,526)
Fair Value	84,141	84,492
Agency Fixed- Rate | Fannie Mae
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	889,070	915,039
Unrealized Gains	273	0
Unrealized Losses	(18,408)	(33,195)
Fair Value	870,935	881,844
Agency Fixed- Rate | Ginnie Mae
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	0	0
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	0	0
Agency RMBS
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	1,045,418	1,076,006
Unrealized Gains	279	8
Unrealized Losses	(21,759)	(38,284)
Fair Value	1,023,938	1,037,730
Non-Agency RMBS
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	310,763	215,337
Unrealized Gains	3,738	166
Unrealized Losses	(415)	(1,466)
Fair Value	$ 314,086	214,037
Weighted average reset period	8 months
CMBS
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 236,873	243,046
Unrealized Gains	9,068	17,815
Unrealized Losses	0	(376)
Fair Value	$ 245,941	260,485
Weighted average reset period	1 month
CMBS | Available-for-sale securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Investment securities, available for sale held in securitization trusts		$ 52,700

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Debt Securities, Available-for-sale, Weighted Average Reset Period

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The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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