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MORTGAGE BANKING OPERATIONS - Single Family MSR Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Additions and amortization:
Amortization	$ 4,579	$ 4,401	$ 15,453	$ 12,246
Changes in fair value of MSR assumptions	747	(2,960)	7,186	(21,970)
Ending balance	61,206		61,206
Single family
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	59,872	47,804	49,966	68,109
Additions and amortization:
Originations	5,166	6,569	19,507	12,942
Amortization	(4,579)	(4,401)	(15,453)	(12,246)
Net additions and amortization	587	2,168	4,054	696
Changes in fair value of MSR assumptions	747	(2,954)	7,186	(21,787)
Ending balance	$ 61,206	$ 47,018	$ 61,206	$ 47,018

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Changes in the fair value of mortgage servicing rights due to modeled amortization.

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Servicing Asset at Fair Value, Additions and Amortization, Net

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The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of increase (decrease) from changes in fair value classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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