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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Fair Value	$ (49,066)	$ (47,363)
Notional Amount	5,911,385	6,644,081
Derivative Liabilities
Derivative [Line Items]
Fair Value	(84,855)	(63,081)
Notional Amount	2,953,724	3,485,466
Derivative Assets
Derivative [Line Items]
Fair Value	35,789	15,718
Notional Amount	2,957,661	3,158,615
Interest rate agreements | Derivative Liabilities
Derivative [Line Items]
Fair Value	(36,416)	(11,888)
Notional Amount	1,742,000	1,248,000
Interest rate agreements | Derivative Liabilities | Cash Flow Hedging
Derivative [Line Items]
Fair Value	(34,492)	(43,679)
Notional Amount	139,500	139,500
Interest rate agreements | Derivative Assets
Derivative [Line Items]
Fair Value	28,211	10,122
Notional Amount	2,106,500	1,765,000
TBAs
Derivative [Line Items]
Notional Amount	1,460,000	1,700,000
TBAs | Derivative Liabilities
Derivative [Line Items]
Fair Value	(13,215)	(3,808)
Notional Amount	935,000	1,400,000
TBAs | Derivative Assets
Derivative [Line Items]
Fair Value	4,665	133
Notional Amount	520,000	295,000
Futures
Derivative [Line Items]
Notional Amount		8,000
Futures | Derivative Assets
Derivative [Line Items]
Fair Value	0	1
Notional Amount	0	7,500
Swaptions | Derivative Assets
Derivative [Line Items]
Fair Value	0	42
Notional Amount	0	200,000
Loan purchase commitments | Derivative Liabilities
Derivative [Line Items]
Fair Value	(732)	(3,706)
Notional Amount	137,224	697,966
Loan purchase commitments | Derivative Assets
Derivative [Line Items]
Fair Value	2,913	3,243
Notional Amount	331,161	547,434
Loan forward sale commitments | Derivative Assets
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

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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- Definition

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+ References

No definition available.

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