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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

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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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 No definition available. + Details
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