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Derivative Financial Instruments - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) counterparty	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) counterparty	Sep. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Notional amount	$ 10,799,279		$ 10,799,279			$ 5,911,385
Accumulated other comprehensive income (loss)	$ 1,785,059	$ 1,361,327	$ 1,785,059	$ 1,361,327	$ 1,564,032	1,348,794	$ 1,228,955	$ 1,212,287
Number of counterparties | counterparty	6		6
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges
Derivative [Line Items]
Accumulated other comprehensive income (loss)	$ (61,175)		$ (61,175)		$ (49,384)	(34,045)
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges
Derivative [Line Items]
Accumulated other comprehensive income (loss)		(26,304)		(26,304)		(34,000)	$ (31,105)	$ (42,953)
Derivative Liabilities
Derivative [Line Items]
Notional amount	6,148,072		6,148,072			2,953,724
Mortgage Banking Activities, Net
Derivative [Line Items]
Market valuations gains (losses), net	6,205	10,911	33,625	46,663
Loan purchase commitments and forward sales commitments | Mortgage Banking Activities, Net
Derivative [Line Items]
Market valuations gains (losses), net	14,000	2,000	42,000	(8,000)
Interest rate contract
Derivative [Line Items]
Notional amount	5,710,000		5,710,000			3,850,000
TBAs
Derivative [Line Items]
Notional amount	3,620,000		3,620,000			1,460,000
TBAs | Derivative Liabilities
Derivative [Line Items]
Notional amount	1,655,000		1,655,000			935,000
Unsecuritized Residential and Commercial Loans
Derivative [Line Items]
Derivative gain (loss)	(36,000)	25,000	(147,000)	114,000
Interest rate swaps | Cash Flow Hedging
Derivative [Line Items]
Derivative gain (loss)	(12,000)	$ 5,000	(27,000)	$ 17,000
Interest rate swaps | Derivative Liabilities
Derivative [Line Items]
Notional amount	3,896,300		3,896,300			1,742,000
Interest rate swaps | Derivative Liabilities | Cash Flow Hedging
Derivative [Line Items]
Notional amount	$ 139,500		$ 139,500			$ 139,500

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

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