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Derivative Financial Instruments - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) counterparty	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) counterparty	Jun. 30, 2017 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Derivative [Line Items]
Notional amount	$ 7,630,759		$ 7,630,759			$ 6,644,081
Net unrealized gain (loss) on interest rate agreements	3,417	$ (2,429)	11,848	$ (696)
Accumulated other comprehensive income	$ 1,228,955	1,179,424	$ 1,228,955	1,179,424		1,212,287		$ 1,149,428
Number of counterparties (in counterparties) | counterparty	2		2
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges
Derivative [Line Items]
Accumulated other comprehensive income	$ (31,105)	(44,688)	$ (31,105)	(44,688)	$ (34,522)	(42,953)	$ (42,273)	$ (44,020)
Derivative Liabilities
Derivative [Line Items]
Notional amount	3,264,639		3,264,639			3,485,466
Mortgage Banking Activities, Net
Derivative [Line Items]
Market valuations gains and losses, net	9,514	10,880	35,752	28,277
Loan purchase commitments | Mortgage Banking Activities, Net
Derivative [Line Items]
Market valuations gains and losses, net	(2,758)	10,406	(9,726)	20,671
Interest rate contract
Derivative [Line Items]
Notional amount	3,500,000		3,500,000			3,210,000
TBAs
Derivative [Line Items]
Notional amount	2,720,000		2,720,000			1,700,000
TBAs | Derivative Liabilities
Derivative [Line Items]
Notional amount	1,485,000		1,485,000			1,400,000
Futures
Derivative [Line Items]
Notional amount	15,000		15,000			8,000
Futures | Derivative Liabilities
Derivative [Line Items]
Notional amount	15,000		15,000			0
Unsecuritized Residential and Commercial Loans
Derivative [Line Items]
Derivative gain (loss)	22,000	(20,000)	89,000	(27,000)
Interest rate swaps | Cash Flow Hedging
Derivative [Line Items]
Derivative gain (loss)	3,000	$ (2,000)
Net unrealized gain (loss) on interest rate agreements			12,000	$ (1,000)
Interest rate swaps | Derivative Liabilities
Derivative [Line Items]
Notional amount	820,000		820,000			1,248,000
Interest rate swaps | Derivative Liabilities | Cash Flow Hedging
Derivative [Line Items]
Notional amount	$ 139,500		$ 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
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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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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.

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