SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Real Estate Owned [Roll Forward]
Beginning balance	$ 45,299	$ 93,672
Purchases	2,464	6,502
Transfer of loans to real estate owned	30,015	43,409
Sales	(60,407)	(101,035)
Valuation (provision) reversal	4,270	2,751
Ending balance	$ 21,641	$ 45,299

Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4313-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586

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