Derivative Financial Instruments - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Derivative assets:
Margin deposits placed with counterparties	$ (154,321)		$ (135,645)
Derivative asset, before netting	145,678		258,809
Netting	(36,691)		(79,730)
Total derivative assets	108,987		179,079
Derivative liabilities:
Derivative liability, before netting	46,435		101,866
Netting	(5,651)		(48,591)
Net amounts of liabilities presented in the consolidated balance sheet	40,784		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	(294,645)	$ 47,227
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	52,237	(94,798)
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	(294,334)	47,227
Margin Deposits
Derivative assets:
Collateral placed with (received from) derivative counterparties	(31,040)		(31,139)
Interest rate lock commitments
Derivative assets:
Total derivative assets	74,545		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	(19,786)	$ 33,002
Forward contracts | Purchases
Derivative Instruments
Notional amount	14,624,053		15,863,667
Derivative assets:
Derivative asset, before netting	21,887		78,448
Derivative liabilities:
Derivative liability, before netting	6,049		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	14,624,053
Forward contracts | Sales
Derivative Instruments
Notional amount	17,168,191		14,477,159
Derivative assets:
Derivative asset, before netting	18,622		6,151
Derivative liabilities:
Derivative liability, before netting	35,649		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	17,168,191
MBS put options
Derivative Instruments
Notional amount	2,700,000		2,925,000
Derivative assets:
Derivative asset, before netting	1,970		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	2,700,000
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	8,917,500		8,717,500
Derivative assets:
Derivative asset, before netting	25,353		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	8,917,500
Call options on Eurodollar futures | Purchases
Derivative Instruments
Notional amount	1,625,000		4,250,000
Derivative assets:
Derivative asset, before netting	3,301		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	1,625,000
Treasury future | Purchases
Derivative Instruments
Notional amount	8,068,300		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	8,068,300
Treasury future | Sales
Derivative Instruments
Notional amount	9,408,000		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	9,408,000
Not designated as hedging instrument | Interest rate lock commitments
Derivative Instruments
Notional amount	7,270,122		6,349,628
Derivative assets:
Derivative asset, before netting	74,545		90,313
Derivative liabilities:
Derivative liability, before netting	4,737		$ 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	$ 7,270,122