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Derivative Financial Instruments - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) counterparty	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) counterparty	Jun. 30, 2018 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Notional amount	$ 7,597,742		$ 7,597,742			$ 5,911,385
Accumulated other comprehensive income (loss)	$ 1,564,032	$ 1,228,955	$ 1,564,032	$ 1,228,955	$ 1,549,927	1,348,794	$ 1,219,983	$ 1,212,287
Number of counterparties | counterparty	3		3
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges
Derivative [Line Items]
Accumulated other comprehensive income (loss)	$ (49,384)		$ (49,384)		$ (39,883)	(34,045)
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges
Derivative [Line Items]
Accumulated other comprehensive income (loss)		(31,105)		(31,105)		(34,000)	$ (34,522)	$ (42,953)
Derivative Liabilities
Derivative [Line Items]
Notional amount	4,618,911		4,618,911			2,953,724
Mortgage Banking Activities, Net
Derivative [Line Items]
Market valuations gains (losses), net	15,730	9,514	27,420	35,752
Loan purchase commitments and forward sales commitments | Mortgage Banking Activities, Net
Derivative [Line Items]
Market valuations gains (losses), net	17,000	(3,000)	29,000	(10,000)
Interest rate contract
Derivative [Line Items]
Notional amount	4,340,000		4,340,000			3,850,000
TBAs
Derivative [Line Items]
Notional amount	2,100,000		2,100,000			1,460,000
TBAs | Derivative Liabilities
Derivative [Line Items]
Notional amount	1,150,000		1,150,000			935,000
Unsecuritized Residential and Commercial Loans
Derivative [Line Items]
Derivative gain (loss)	(66,000)	22,000	(111,000)	89,000
Interest rate swaps | Cash Flow Hedging
Derivative [Line Items]
Derivative gain (loss)	(10,000)	$ 3,000	(15,000)	$ 12,000
Interest rate swaps | Derivative Liabilities
Derivative [Line Items]
Notional amount	3,084,300		3,084,300			1,742,000
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
-Sentence Column B

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
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