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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Fair Value	$ 7,343	$ (47,363)
Notional Amount	7,639,175	6,644,081
TBAs
Derivative [Line Items]
Notional Amount	2,630,000	1,700,000
Futures
Derivative [Line Items]
Notional Amount	15,000	8,000
Derivative Liabilities
Derivative [Line Items]
Fair Value	(56,201)	(63,081)
Notional Amount	2,684,123	3,485,466
Derivative Liabilities | Interest rate swaps
Derivative [Line Items]
Fair Value	(11,346)	(11,888)
Notional Amount	451,500	1,248,000
Derivative Liabilities | Interest rate swaps | Cash Flow Hedging
Derivative [Line Items]
Fair Value	(35,167)	(43,679)
Notional Amount	139,500	139,500
Derivative Liabilities | TBAs
Derivative [Line Items]
Fair Value	(5,457)	(3,808)
Notional Amount	1,110,000	1,400,000
Derivative Liabilities | Futures
Derivative [Line Items]
Fair Value	(357)	0
Notional Amount	15,000	0
Derivative Liabilities | Loan purchase commitments
Derivative [Line Items]
Fair Value	(2,605)	(3,706)
Notional Amount	627,803	697,966
Derivative Liabilities | Loan forward sale commitments
Derivative [Line Items]
Fair Value	(1,269)	0
Notional Amount	340,320	0
Derivative Assets
Derivative [Line Items]
Fair Value	63,544	15,718
Notional Amount	4,955,052	3,158,615
Derivative Assets | Interest rate swaps
Derivative [Line Items]
Fair Value	50,919	10,122
Notional Amount	2,869,500	1,765,000
Derivative Assets | TBAs
Derivative [Line Items]
Fair Value	8,625	133
Notional Amount	1,515,000	295,000
Derivative Assets | Futures
Derivative [Line Items]
Fair Value	0	1
Notional Amount	0	7,500
Derivative Assets | Swaptions
Derivative [Line Items]
Fair Value	0	42
Notional Amount	0	200,000
Derivative Assets | Loan purchase commitments
Derivative [Line Items]
Fair Value	4,000	3,243
Notional Amount	570,552	547,434
Derivative Assets | Loan forward sale commitments
Derivative [Line Items]
Fair Value	0	2,177
Notional Amount	$ 0	$ 343,681

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611

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- Definition

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.

+ References

No definition available.

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