Derivative Activities - Other Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative assets:
Margin deposits placed with counterparties	$ (55,968)	$ (100,482)
Derivative asset, before netting	157,995	398,672
Netting	(58,992)	(64,977)
Total derivative assets	99,003	333,695
Derivative liabilities:
Derivative liability, before netting	83,246	54,702
Netting	(61,534)	(32,096)
Net amounts of liabilities presented in the consolidated balance sheet	21,712	22,606
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Gains (losses) recognized on derivative financial instruments	(631,484)	(475,215)	$ 918,180
Repurchase agreement derivative
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Gains (losses) recognized on derivative financial instruments			83
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	1,326,964	319,141	(650,898)
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	(631,484)	(475,215)	918,180
Margin Deposits
Derivative assets:
Collateral placed with (received from) derivative counterparties	2,542	(32,881)
Interest rate lock commitments
Derivative assets:
Total derivative assets	36,728	323,473
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Gains (losses) recognized on derivative financial instruments	(296,349)	(354,833)	$ 540,376
Not designated as hedging instrument | Interest rate lock commitments
Derivative Instruments
Notional amount	7,009,119	14,111,795
Derivative assets:
Derivative asset, before netting	36,728	323,473
Derivative liabilities:
Derivative liability, before netting	10,884	1,280
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period	14,111,795
Balance at end of period	7,009,119	14,111,795
Not designated as hedging instrument | Forward contracts | Purchases
Derivative Instruments
Notional amount	8,320,849	22,007,383
Derivative assets:
Derivative asset, before netting	2,433	20,485
Derivative liabilities:
Derivative liability, before netting	48,670	18,007
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period	22,007,383
Balance at end of period	8,320,849	22,007,383
Not designated as hedging instrument | Forward contracts | Sales
Derivative Instruments
Notional amount	12,487,760	34,429,676
Derivative assets:
Derivative asset, before netting	80,754	40,215
Derivative liabilities:
Derivative liability, before netting	20,684	35,415
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period	34,429,676
Balance at end of period	12,487,760	34,429,676
Not designated as hedging instrument | MBS put options
Derivative Instruments
Notional amount	1,750,000	9,550,000
Derivative assets:
Derivative asset, before netting	6,057	7,655
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period	9,550,000
Balance at end of period	1,750,000	9,550,000
Not designated as hedging instrument | Swaptions | Purchases
Derivative Instruments
Notional amount		5,375,000
Derivative assets:
Derivative asset, before netting		1,625
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period	5,375,000
Balance at end of period		5,375,000
Not designated as hedging instrument | Put options on Eurodollar futures | Purchases
Derivative Instruments
Notional amount	6,800,000	2,450,000
Derivative assets:
Derivative asset, before netting	29,203	3,141
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period	2,450,000
Balance at end of period	6,800,000	2,450,000
Not designated as hedging instrument | 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 end of period	250,000
Not designated as hedging instrument | Call options on Eurodollar futures | Purchases
Derivative Instruments
Notional amount	1,350,000	1,250,000
Derivative assets:
Derivative asset, before netting	2,820	2,078
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period	1,250,000
Balance at end of period	1,350,000	1,250,000
Not designated as hedging instrument | Treasury future | Purchases
Derivative Instruments
Notional amount	3,709,200	1,544,800
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period	1,544,800
Balance at end of period	3,709,200	1,544,800
Not designated as hedging instrument | Treasury future | Sales
Derivative Instruments
Notional amount	3,456,900	1,925,000
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period	1,925,000
Balance at end of period	3,456,900	1,925,000
Not designated as hedging instrument | Interest rate swap futures | Purchases
Derivative Instruments
Notional amount		3,010,600
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period	3,010,600
Balance at end of period		3,010,600
Not designated as hedging instrument | Interest rate swap futures | Sales
Derivative Instruments
Notional amount		2,187,200
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value
Balance at beginning of period	$ 2,187,200
Balance at end of period		$ 2,187,200