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FAIR VALUE MEASUREMENT - Schedule of Fair Value Changes and Activity for Level 3 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest rate lock commitments
Fair Value Changes and Activity for Level 3 [Roll Forward]
Beginning balance	$ 5,893	$ 17,967	$ 17,392	$ 2,223
Payoffs/Sales/Settlements	(6,583)	(15,292)	(21,895)	(27,576)
Change in mark to market/Realized/unrealized gains (losses)	5,299	18,285	9,112	46,313
Ending balance	4,609	20,960	4,609	20,960
Investment securities AFS
Fair Value Changes and Activity for Level 3 [Roll Forward]
Beginning balance	2,550	2,861	2,710	1,952
Additions	0	0	0	985
Transfers	0	0	0	0
Payoffs/Sales/Settlements	(48)	(48)	(144)	(387)
Change in mark to market/Realized/unrealized gains (losses)	12	(16)	(52)	247
Ending balance	2,514	2,797	2,514	2,797
Single family LHFI
Fair Value Changes and Activity for Level 3 [Roll Forward]
Beginning balance	5,207	5,847	7,108	3,468
Additions	284	2,169	1,429	5,515
Transfers	0	0	0	0
Payoffs/Sales/Settlements	(1,088)	(352)	(4,279)	(1,135)
Change in mark to market/Realized/unrealized gains (losses)	104	(26)	249	(210)
Ending balance	$ 4,507	$ 7,638	$ 4,507	$ 7,638

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-SubTopic 10
-Section 50
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- Definition

Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

+ References

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- Definition

Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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