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Derivative Financial Instruments - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) counterparty	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Derivative [Line Items]
Notional amount	$ 7,639,175		$ 6,644,081
Accumulated other comprehensive income	$ 1,219,983	$ 1,165,771	1,212,287	$ 1,149,428
Number of counterparties (in counterparties) | counterparty	2
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges
Derivative [Line Items]
Accumulated other comprehensive income	$ (34,522)	(42,273)	(42,953)	$ (44,020)
Mortgage Banking Activities, Net
Derivative [Line Items]
Market valuations gains and losses, net	26,238	17,397
Derivative Liabilities
Derivative [Line Items]
Notional amount	2,684,123		3,485,466
Loan purchase commitments | Mortgage Banking Activities, Net
Derivative [Line Items]
Market valuations gains and losses, net	(6,968)	10,265
Interest rate contract
Derivative [Line Items]
Notional amount	3,320,000		3,210,000
TBAs
Derivative [Line Items]
Notional amount	2,630,000		1,700,000
TBAs | Derivative Liabilities
Derivative [Line Items]
Notional amount	1,110,000		1,400,000
Futures
Derivative [Line Items]
Notional amount	15,000		8,000
Futures | Derivative Liabilities
Derivative [Line Items]
Notional amount	15,000		0
Unsecuritized Residential and Commercial Loans
Derivative [Line Items]
Derivative gain (loss)	67,000	(7,000)
Interest rate swaps | Cash Flow Hedging
Derivative [Line Items]
Derivative gain (loss)	8,000	$ 2,000
Interest rate swaps | Derivative Liabilities
Derivative [Line Items]
Notional amount	451,500		1,248,000
Interest rate swaps | Derivative Liabilities | Cash Flow Hedging
Derivative [Line Items]
Notional amount	$ 139,500		$ 139,500

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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Derivative, Number Of Counterparties

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- Definition

Increase (Decrease) in Fair Value Adjustments on Assets

+ References

No definition available.

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 4.E)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707

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