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Investment Securities Available for Sale - Schedule of Available for Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 1,315,465	$ 1,417,724
Unrealized Gains	19,197	21,031
Unrealized Losses	(44,647)	(25,674)
Fair Value	1,290,015	1,413,081
Agency ARMs
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	82,239	93,331
Unrealized Gains	10	22
Unrealized Losses	(2,921)	(2,281)
Fair Value	79,328	91,072
Agency ARMs | Freddie Mac
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	29,384	33,623
Unrealized Gains	0	16
Unrealized Losses	(1,161)	(852)
Fair Value	28,223	32,787
Agency ARMs | Fannie Mae
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	48,610	54,958
Unrealized Gains	10	6
Unrealized Losses	(1,624)	(1,236)
Fair Value	46,996	53,728
Agency ARMs | Ginnie Mae
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	4,245	4,750
Unrealized Gains	0	0
Unrealized Losses	(136)	(193)
Fair Value	4,109	4,557
Agency Fixed- Rate
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	1,063,732	1,059,532
Unrealized Gains	0	669
Unrealized Losses	(41,716)	(12,916)
Fair Value	1,022,016	1,047,285
Agency Fixed- Rate | Freddie Mac
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	92,189	20,804
Unrealized Gains	0	0
Unrealized Losses	(3,023)	(736)
Fair Value	89,166	20,068
Agency Fixed- Rate | Fannie Mae
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	971,543	1,038,363
Unrealized Gains	0	669
Unrealized Losses	(38,693)	(12,174)
Fair Value	932,850	1,026,858
Agency Fixed- Rate | Ginnie Mae
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	0	365
Unrealized Gains	0	0
Unrealized Losses	0	(6)
Fair Value	0	359
Agency IOs
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	0	41,367
Unrealized Gains	0	271
Unrealized Losses	0	(10,459)
Fair Value	0	31,179
Agency IOs | Freddie Mac
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	0	8,436
Unrealized Gains	0	19
Unrealized Losses	0	(2,756)
Fair Value	0	5,699
Agency IOs | Fannie Mae
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	0	11,310
Unrealized Gains	0	22
Unrealized Losses	0	(2,989)
Fair Value	0	8,343
Agency IOs | Ginnie Mae
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	0	21,621
Unrealized Gains	0	230
Unrealized Losses	0	(4,714)
Fair Value	0	17,137
Agency RMBS
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	1,145,971	1,194,230
Unrealized Gains	10	962
Unrealized Losses	(44,637)	(25,656)
Fair Value	1,101,344	1,169,536
Non-Agency RMBS
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	53,695	100,291
Unrealized Gains	372	1,852
Unrealized Losses	(10)	(18)
Fair Value	54,057	102,125
CMBS
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	115,799	123,203
Unrealized Gains	18,815	18,217
Unrealized Losses	0	0
Fair Value	134,614	141,420
CMBS | Available-for-sale securities
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value (including pledged securities of $976,113 and $1,076,187, as of June 30, 2018 and December 31, 2017, respectively, and $50,134 and $47,922 held in securitization trusts as of June 30, 2018 and December 31, 2017, respectively)	$ 50,100	$ 47,900

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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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