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Derivative Financial Instruments - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) counterparty	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Derivative [Line Items]
Notional amount	$ 13,589,356	$ 5,911,385
Net unrealized (loss) gain on interest rate agreements		8,908	$ 1,022
Stockholders' equity attributable to parent	$ 1,827,231	1,348,794	1,212,287	$ 1,149,428
Number of counterparties | counterparty	9
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges
Derivative [Line Items]
Stockholders' equity attributable to parent	$ (50,939)	(34,045)
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges
Derivative [Line Items]
Stockholders' equity attributable to parent		(34,045)	(42,953)
Derivative Liabilities
Derivative [Line Items]
Notional amount	6,929,494	2,953,724
Mortgage Banking Activities, Net
Derivative [Line Items]
Changes in fair value of assets	69,326	57,000	51,844
LPCs, IRLCs, and FSCs | Mortgage Banking Activities, Net
Derivative [Line Items]
Changes in fair value of assets	62,000	(1,000)	38,000
Interest Rate Contract
Derivative [Line Items]
Notional amount	4,780,000	3,850,000
TBAs
Derivative [Line Items]
Notional amount	6,610,000	1,460,000
TBAs | Derivative Liabilities
Derivative [Line Items]
Notional amount	4,160,000	935,000
Interest rate futures
Derivative [Line Items]
Notional amount	226,000
Interest rate futures | Derivative Liabilities
Derivative [Line Items]
Notional amount	12,300	0
Residential and Commercial Loans
Derivative [Line Items]
Valuation adjustments on derivatives	(134,000)	40,000	(31,000)
Interest rate agreements | Cash Flow Hedging
Derivative [Line Items]
Valuation adjustments on derivatives	(17,000)	9,000	$ 1,000
Interest rate agreements | Derivative Liabilities
Derivative [Line Items]
Notional amount	2,314,300	1,742,000
Interest rate agreements | Derivative Liabilities | Cash Flow Hedging
Derivative [Line Items]
Notional amount	$ 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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-Name Accounting Standards Codification
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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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