FAIR VALUE - Financial Statement Items on Recurring Basis by Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets
Loans held for sale	$ 4,656,338	$ 8,136,817
Trading securities, at fair value	105,308	72,874
Derivative assets	153,607	194,665
Servicing rights	2,213,700	2,006,712
Liabilities
Derivative liabilities	72,758	37,797
Interest rate lock commitments
Assets
Derivative assets	91,886	184,383
Liabilities
Derivative liabilities	34,281	3,763
Interest rate swap futures
Assets
Derivative assets	0	4,924
Liabilities
Derivative liabilities	5,746	0
Forward sale contracts
Assets
Derivative assets	43,926	5,358
Liabilities
Derivative liabilities	10,694	2,964
MBS put options
Assets
Derivative assets	17,795
Liabilities
Derivative liabilities	12,924
Put options on treasuries
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	9,113	31,070
Fair Value, Recurring
Assets
Loans held for sale	4,656,338	8,136,817
Trading securities, at fair value	105,308	72,874
Servicing rights	2,213,700	2,006,712
Total assets at fair value	7,128,953	10,411,068
Liabilities
Servicing rights	9,107	7,310
Total liabilities at fair value	81,865	45,107
Fair Value, Recurring \| Interest rate lock commitments
Assets
Derivative assets	91,886	184,383
Liabilities
Derivative liabilities	34,281	3,763
Fair Value, Recurring \| Interest rate swap futures
Assets
Derivative assets		4,924
Liabilities
Derivative liabilities	5,746
Fair Value, Recurring \| Forward sale contracts
Assets
Derivative assets	43,926	5,358
Liabilities
Derivative liabilities	10,694	2,964
Fair Value, Recurring \| MBS put options
Assets
Derivative assets	17,795
Liabilities
Derivative liabilities	12,924
Fair Value, Recurring \| Put options on treasuries
Liabilities
Derivative liabilities	9,113	31,070
Fair Value, Recurring \| Level 1
Assets
Loans held for sale	0	0
Trading securities, at fair value	0	0
Servicing rights	0	0
Total assets at fair value	0	4,924
Liabilities
Servicing rights	0	0
Total liabilities at fair value	14,859	31,070
Fair Value, Recurring \| Level 1 \| Interest rate lock commitments
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Recurring \| Level 1 \| Interest rate swap futures
Assets
Derivative assets		4,924
Liabilities
Derivative liabilities	5,746
Fair Value, Recurring \| Level 1 \| Forward sale contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Recurring \| Level 1 \| MBS put options
Assets
Derivative assets	0
Liabilities
Derivative liabilities	0
Fair Value, Recurring \| Level 1 \| Put options on treasuries
Liabilities
Derivative liabilities	9,113	31,070
Fair Value, Recurring \| Level 2
Assets
Loans held for sale	4,656,338	8,136,817
Trading securities, at fair value	105,308	72,874
Servicing rights	0	0
Total assets at fair value	4,823,367	8,215,049
Liabilities
Servicing rights	0	0
Total liabilities at fair value	23,618	2,964
Fair Value, Recurring \| Level 2 \| Interest rate lock commitments
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Recurring \| Level 2 \| Interest rate swap futures
Assets
Derivative assets		0
Liabilities
Derivative liabilities	0
Fair Value, Recurring \| Level 2 \| Forward sale contracts
Assets
Derivative assets	43,926	5,358
Liabilities
Derivative liabilities	10,694	2,964
Fair Value, Recurring \| Level 2 \| MBS put options
Assets
Derivative assets	17,795
Liabilities
Derivative liabilities	12,924
Fair Value, Recurring \| Level 2 \| Put options on treasuries
Liabilities
Derivative liabilities	0	0
Fair Value, Recurring \| Level 3
Assets
Loans held for sale	0	0
Trading securities, at fair value	0	0
Servicing rights	2,213,700	2,006,712
Total assets at fair value	2,305,586	2,191,095
Liabilities
Servicing rights	9,107	7,310
Total liabilities at fair value	43,388	11,073
Fair Value, Recurring \| Level 3 \| Interest rate lock commitments
Assets
Derivative assets	91,886	184,383
Liabilities
Derivative liabilities	34,281	3,763
Fair Value, Recurring \| Level 3 \| Interest rate swap futures
Assets
Derivative assets		0
Liabilities
Derivative liabilities	0
Fair Value, Recurring \| Level 3 \| Forward sale contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Recurring \| Level 3 \| MBS put options
Assets
Derivative assets	0
Liabilities
Derivative liabilities	0
Fair Value, Recurring \| Level 3 \| Put options on treasuries
Liabilities
Derivative liabilities	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Fair value of a liability representing servicing arrangements under which the estimated future revenue from contractually specified servicing fees, late charges, and other ancillary revenues are not expected to adequately compensate the servicer.

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