FAIR VALUE - Financial Statement Items on Recurring Basis by Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets
Loans held for sale	$ 2,692,820	$ 8,136,817
Trading securities, at fair value	97,210	72,874
Derivative assets:	316,647	194,665
Servicing rights	2,030,026	2,006,712
Liabilities
Derivative liabilities:	149,837	37,797
Interest rate lock commitments
Assets
Derivative assets:	20,910	184,383
Liabilities
Derivative liabilities:	85,628	3,763
Forward sale contracts
Assets
Derivative assets:	295,737	5,358
Liabilities
Derivative liabilities:	38,086	2,964
Interest rate swap futures
Assets
Derivative assets:	0	4,924
Liabilities
Derivative liabilities:	19,480	0
Put options on treasuries
Assets
Derivative assets:	0	0
Liabilities
Derivative liabilities:	6,643	31,070
Fair Value, Recurring
Assets
Loans held for sale	2,692,820	8,136,817
Trading securities, at fair value	97,210	72,874
Servicing rights	2,030,026	2,006,712
Total assets at fair value	5,136,703	10,411,068
Liabilities
Servicing rights	16,757	7,310
Total liabilities at fair value	166,594	45,107
Fair Value, Recurring \| Interest rate lock commitments
Assets
Derivative assets:	20,910	184,383
Liabilities
Derivative liabilities:	85,628	3,763
Fair Value, Recurring \| Forward sale contracts
Assets
Derivative assets:	295,737	5,358
Liabilities
Derivative liabilities:	38,086	2,964
Fair Value, Recurring \| Interest rate swap futures
Assets
Derivative assets:		4,924
Liabilities
Derivative liabilities:	19,480
Fair Value, Recurring \| Put options on treasuries
Liabilities
Derivative liabilities:	6,643	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	26,123	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 \| Forward sale contracts
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:	19,480
Fair Value, Recurring \| Level 1 \| Put options on treasuries
Liabilities
Derivative liabilities:	6,643	31,070
Fair Value, Recurring \| Level 2
Assets
Loans held for sale	2,692,820	8,136,817
Trading securities, at fair value	97,210	72,874
Servicing rights	0	0
Total assets at fair value	3,085,767	8,215,049
Liabilities
Servicing rights	0	0
Total liabilities at fair value	38,086	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 \| Forward sale contracts
Assets
Derivative assets:	295,737	5,358
Liabilities
Derivative liabilities:	38,086	2,964
Fair Value, Recurring \| Level 2 \| Interest rate swap futures
Assets
Derivative assets:		0
Liabilities
Derivative liabilities:	0
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	2,030,026	2,006,712
Total assets at fair value	2,050,936	2,191,095
Liabilities
Servicing rights	16,757	7,310
Total liabilities at fair value	102,385	11,073
Fair Value, Recurring \| Level 3 \| Interest rate lock commitments
Assets
Derivative assets:	20,910	184,383
Liabilities
Derivative liabilities:	85,628	3,763
Fair Value, Recurring \| Level 3 \| Forward sale contracts
Assets
Derivative assets:	0	0
Liabilities
Derivative liabilities:	0	0
Fair Value, Recurring \| Level 3 \| Interest rate swap futures
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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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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