Derivative Financial Instruments - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Derivative assets:
Derivative asset, before netting	$ 246,693		$ 246,693		$ 258,809
Netting	(56,081)		(56,081)		(79,730)
Total derivative assets	190,612		190,612		179,079
Derivative liabilities:
Derivative liability, before netting	103,236		103,236		101,866
Netting	(61,765)		(61,765)		(48,591)
Net amounts of liabilities presented in the consolidated balance sheet	41,471		41,471		53,275
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Gains (losses) recognized on derivative financial instruments	242,051	$ (423,656)	(224,371)	$ (531,565)
Interest rate lock commitments and loans held for sale
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Gains (losses) recognized on derivative financial instruments	(217,380)	162,006	(112,188)	217,968
Mortgage servicing rights
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Gains (losses) recognized on derivative financial instruments	193,081	(423,656)	(256,570)	(531,565)
Margin Deposits
Derivative assets:
Collateral placed with (received from) derivative counterparties	5,684		5,684		(31,139)
Interest rate lock commitments
Derivative assets:
Total derivative assets	120,837		120,837		90,313
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Gains (losses) recognized on derivative financial instruments	49,862	$ (9,862)	29,021	$ (5,069)
Forward contracts | Purchases
Derivative Instruments
Notional amount	26,839,882		26,839,882		15,863,667
Derivative assets:
Derivative asset, before netting	10,878		10,878		78,448
Derivative liabilities:
Derivative liability, before netting	50,487		50,487		5,141
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of year			15,863,667
Balance at end of year	26,839,882		26,839,882
Forward contracts | Sales
Derivative Instruments
Notional amount	29,548,275		29,548,275		14,477,159
Derivative assets:
Derivative asset, before netting	57,180		57,180		6,151
Derivative liabilities:
Derivative liability, before netting	36,855		36,855		92,796
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of year			14,477,159
Balance at end of year	29,548,275		29,548,275
MBS put options
Derivative Instruments
Notional amount	1,850,000		1,850,000		2,925,000
Derivative assets:
Derivative asset, before netting	1,892		1,892		413
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of year			2,925,000
Balance at end of year	1,850,000		1,850,000
MBS call options
Derivative Instruments
Notional amount					1,000,000
Derivative assets:
Derivative asset, before netting					6,265
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of year			1,000,000
Put options on Eurodollar futures | Purchases
Derivative Instruments
Notional amount	7,650,000		7,650,000		8,717,500
Derivative assets:
Derivative asset, before netting	20,797		20,797		11,043
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of year			8,717,500
Balance at end of year	7,650,000		7,650,000
Call options on Eurodollar futures | Purchases
Derivative Instruments
Notional amount	9,600,000		9,600,000		4,250,000
Derivative assets:
Derivative asset, before netting	35,109		35,109		66,176
Derivative liabilities:
Derivative liability, before netting					3,209
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of year			4,250,000
Balance at end of year	9,600,000		9,600,000
Treasury future | Purchases
Derivative Instruments
Notional amount	8,125,000		8,125,000		5,986,500
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of year			5,986,500
Balance at end of year	8,125,000		8,125,000
Treasury future | Sales
Derivative Instruments
Notional amount	11,379,000		11,379,000		10,677,000
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of year			10,677,000
Balance at end of year	11,379,000		11,379,000
Call options on futures | Sales
Derivative Instruments
Notional amount	2,500,000		2,500,000
Derivative liabilities:
Derivative liability, before netting	13,672		13,672
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at end of year	2,500,000		2,500,000
Not designated as hedging instrument | Interest rate lock commitments
Derivative Instruments
Notional amount	9,749,537		9,749,537		6,349,628
Derivative assets:
Derivative asset, before netting	120,837		120,837		90,313
Derivative liabilities:
Derivative liability, before netting	2,222		2,222		$ 720
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of year			6,349,628
Balance at end of year	$ 9,749,537		$ 9,749,537