Derivative Financial Instruments - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Derivative assets:
Derivative asset, before netting	$ 206,280		$ 157,995
Netting	(95,616)		(58,992)
Total derivative assets	110,664		99,003
Derivative liabilities:
Derivative liability, before netting	166,766		83,246
Netting	(117,679)		(61,534)
Net amounts of liabilities presented in the consolidated balance sheet	49,087		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	47,227	$ (217,860)
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	(94,798)	700,779
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	47,227	(217,860)
Margin Deposits
Derivative assets:
Collateral placed with (received from) derivative counterparties	22,063		2,542
Interest rate lock commitments
Derivative assets:
Total derivative assets	62,641		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	33,002	$ (284,294)
Forward contracts | Purchases
Derivative Instruments
Notional amount	17,115,689		8,320,849
Derivative assets:
Derivative asset, before netting	78,507		2,433
Derivative liabilities:
Derivative liability, before netting	17,064		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	17,115,689
Forward contracts | Sales
Derivative Instruments
Notional amount	19,698,246		12,487,760
Derivative assets:
Derivative asset, before netting	19,232		80,754
Derivative liabilities:
Derivative liability, before netting	135,827		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	19,698,246
MBS put options
Derivative Instruments
Notional amount	4,100,000		1,750,000
Derivative assets:
Derivative asset, before netting	6,604		6,057
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	4,100,000
MBS call options
Derivative Instruments
Notional amount	750,000
Derivative assets:
Derivative asset, before netting	7,218
Derivative liabilities:
Derivative liability, before netting	7,830
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at end of period	750,000
Put options on Eurodollar futures | Purchases
Derivative Instruments
Notional amount	5,670,000		6,800,000
Derivative assets:
Derivative asset, before netting	11,129		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	5,670,000
Put options on Eurodollar futures | Sales
Derivative Instruments
Notional amount			250,000
Derivative liabilities:
Derivative liability, before netting			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
Call options on Eurodollar futures | Purchases
Derivative Instruments
Notional amount	1,400,000		1,350,000
Derivative assets:
Derivative asset, before netting	20,949		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	1,400,000
Call options on Eurodollar futures | Sales
Derivative Instruments
Notional amount	100,000
Derivative liabilities:
Derivative liability, before netting	2,250
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at end of period	100,000
Treasury future | Purchases
Derivative Instruments
Notional amount	6,068,600		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	6,068,600
Treasury future | Sales
Derivative Instruments
Notional amount	8,310,400		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	8,310,400
Not designated as hedging instrument | Interest rate lock commitments
Derivative Instruments
Notional amount	7,362,534		7,009,119
Derivative assets:
Derivative asset, before netting	62,641		36,728
Derivative liabilities:
Derivative liability, before netting	3,795		$ 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	$ 7,362,534