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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Fair Value	$ (47,363)	$ (29,734)
Notional Amount	6,644,081	4,980,343
Derivative Liabilities
Derivative [Line Items]
Fair Value	(63,081)	(66,329)
Notional Amount	3,485,466	2,423,362
Derivative Assets
Derivative [Line Items]
Fair Value	15,718	36,595
Notional Amount	3,158,615	2,556,981
Interest rate agreements | Derivative Liabilities
Derivative [Line Items]
Fair Value	(11,888)	(12,097)
Notional Amount	1,248,000	1,101,500
Interest rate agreements | Derivative Liabilities | Cash Flow Hedging
Derivative [Line Items]
Fair Value	(43,679)	(44,822)
Notional Amount	139,500	139,500
Interest rate agreements | Derivative Assets
Derivative [Line Items]
Fair Value	10,122	19,859
Notional Amount	1,765,000	1,009,000
TBAs
Derivative [Line Items]
Notional Amount	1,700,000	1,360,000
TBAs | Derivative Liabilities
Derivative [Line Items]
Fair Value	(3,808)	(4,681)
Notional Amount	1,400,000	510,000
TBAs | Derivative Assets
Derivative [Line Items]
Fair Value	133	8,300
Notional Amount	295,000	850,000
Futures
Derivative [Line Items]
Notional Amount	8,000	88,000
Futures | Derivative Liabilities
Derivative [Line Items]
Fair Value	0	(928)
Notional Amount	0	87,500
Futures | Derivative Assets
Derivative [Line Items]
Fair Value	1	0
Notional Amount	7,500	0
Swaptions | Derivative Assets
Derivative [Line Items]
Fair Value	42	5,121
Notional Amount	200,000	345,000
Loan purchase commitments | Derivative Liabilities
Derivative [Line Items]
Fair Value	(3,706)	(3,801)
Notional Amount	697,966	584,862
Loan purchase commitments | Derivative Assets
Derivative [Line Items]
Fair Value	3,243	3,315
Notional Amount	547,434	352,981
Loan forward sale commitments | Derivative Assets
Derivative [Line Items]
Fair Value	2,177	0
Notional Amount	$ 343,681	$ 0

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

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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

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