Derivative Financial Instruments - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Derivative assets:
Derivative asset, before netting	$ 208,513		$ 208,513		$ 157,995
Netting	(105,147)		(105,147)		(58,992)
Total derivative assets	103,366		103,366		99,003
Derivative liabilities:
Derivative liability, before netting	87,203		87,203		83,246
Netting	(46,003)		(46,003)		(61,534)
Net amounts of liabilities presented in the consolidated balance sheet	41,200		41,200		21,712
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Gains (losses) recognized on derivative financial instruments	(423,656)	$ (164,749)	(531,565)	$ (558,614)
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	162,006	363,272	217,968	1,360,341
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	(423,656)	(164,749)	(531,565)	(558,614)
Margin Deposits
Derivative assets:
Collateral placed with (received from) derivative counterparties	(59,144)		(59,144)		2,542
Interest rate lock commitments
Derivative assets:
Total derivative assets	42,385		42,385		36,728
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Gains (losses) recognized on derivative financial instruments	(9,862)	$ (121,353)	(5,069)	$ (378,396)
Forward contracts | Purchases
Derivative Instruments
Notional amount	10,768,362		10,768,362		8,320,849
Derivative assets:
Derivative asset, before netting	7,227		7,227		2,433
Derivative liabilities:
Derivative liability, before netting	41,538		41,538		48,670
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period			8,320,849
Balance at end of period	10,768,362		10,768,362
Forward contracts | Sales
Derivative Instruments
Notional amount	16,995,313		16,995,313		12,487,760
Derivative assets:
Derivative asset, before netting	115,778		115,778		80,754
Derivative liabilities:
Derivative liability, before netting	14,808		14,808		20,684
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period			12,487,760
Balance at end of period	16,995,313		16,995,313
MBS put options
Derivative Instruments
Notional amount	400,000		400,000		1,750,000
Derivative assets:
Derivative asset, before netting	4,408		4,408		6,057
Derivative liabilities:
Derivative liability, before netting	4,301		4,301
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period			1,750,000
Balance at end of period	400,000		400,000
Put options on Eurodollar futures | Purchases
Derivative Instruments
Notional amount	3,775,000		3,775,000		6,800,000
Derivative assets:
Derivative asset, before netting	36,391		36,391		29,203
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period			6,800,000
Balance at end of period	3,775,000		3,775,000
Put options on Eurodollar futures | Sales
Derivative Instruments
Notional amount	325,000		325,000		250,000
Derivative liabilities:
Derivative liability, before netting	4,945		4,945		3,008
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period			250,000
Balance at end of period	325,000		325,000
Call options on Eurodollar futures | Purchases
Derivative Instruments
Notional amount	2,125,000		2,125,000		1,350,000
Derivative assets:
Derivative asset, before netting	2,324		2,324		2,820
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period			1,350,000
Balance at end of period	2,125,000		2,125,000
Treasury future | Purchases
Derivative Instruments
Notional amount	3,559,500		3,559,500		3,709,200
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period			3,709,200
Balance at end of period	3,559,500		3,559,500
Treasury future | Sales
Derivative Instruments
Notional amount	7,036,000		7,036,000		3,456,900
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period			3,456,900
Balance at end of period	7,036,000		7,036,000
Not designated as hedging instrument | Interest rate lock commitments
Derivative Instruments
Notional amount	7,527,726		7,527,726		7,009,119
Derivative assets:
Derivative asset, before netting	42,385		42,385		36,728
Derivative liabilities:
Derivative liability, before netting	21,611		21,611		$ 10,884
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period			7,009,119
Balance at end of period	$ 7,527,726		$ 7,527,726