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LOANS - Rollforward of the Activity of Commercial Real Estate Investments (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Allowance for loan losses |  |
Beginning allowance | $ (169,500) |
Ending allowance | (27,700) | $ (169,500)
Cumulative effect of change in accounting principle for credit losses |  |
Allowance for loan losses |  |
Beginning allowance |  | (37,400)
Commercial Mortgage |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance | 1,372,430 | 1,618,794
Originations & advances (principal) | 128,194 | 218,464
Principal payments | (172,182) | (221,730)
Principal write off |  | (7,000)
Transfers and sales | (1,405,318) | (109,599)
Net (increase) decrease in origination fees | (1,403) | (1,788)
Realized gain |  | 204
Amortization of net origination fees | 1,030 | 5,018
Allowance for loan losses |  |
Beginning allowance | (129,933) | (12,703)
Current period (allowance) reversal | 129,933 | (133,152)
Write offs |  | 23,687
Ending allowance | 0 | (129,933)
Ending balance | 52,684 | 1,372,430
Commercial Mortgage | Cumulative effect of change in accounting principle for credit losses |  |
Allowance for loan losses |  |
Beginning allowance |  | (7,765)
Commercial Mortgage | Mezzanine Loans |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance | 124,156 | 182,726
Originations & advances (principal) | 644 | 12,374
Principal payments | (9,922) | (78)
Principal write off |  | (7,000)
Transfers and sales | (171,794) | (7,100)
Net (increase) decrease in origination fees | 0 | (80)
Realized gain |  | 0
Amortization of net origination fees | 43 | 187
Allowance for loan losses |  |
Beginning allowance | (56,873) | (12,703)
Current period (allowance) reversal | 56,873 | (66,521)
Write offs |  | 23,687
Ending allowance | 0 | (56,873)
Ending balance | 0 | 124,156
Commercial Mortgage | Mezzanine Loans | Cumulative effect of change in accounting principle for credit losses |  |
Allowance for loan losses |  |
Beginning allowance |  | (1,336)
Commercial Mortgage | Senior Mortgages |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance | 373,925 | 499,690
Originations & advances (principal) | 127,481 | 206,090
Principal payments | (75,007) | (77,344)
Principal write off |  | 0
Transfers and sales | (436,408) | (245,120)
Net (increase) decrease in origination fees | (1,403) | (1,055)
Realized gain |  | 204
Amortization of net origination fees | 501 | 2,371
Allowance for loan losses |  |
Beginning allowance | (10,911) | 0
Current period (allowance) reversal | 10,911 | (8,648)
Write offs |  | 0
Ending allowance | 0 | (10,911)
Ending balance | 0 | 373,925
Commercial Mortgage | Senior Mortgages | Cumulative effect of change in accounting principle for credit losses |  |
Allowance for loan losses |  |
Beginning allowance |  | (2,263)
Commercial Mortgage | Senior Securitized Mortgages |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance | 874,349 | 936,378
Originations & advances (principal) | 69 | 0
Principal payments | (87,253) | (144,308)
Principal write off |  | 0
Transfers and sales | (797,116) | 142,621
Net (increase) decrease in origination fees | 0 | (653)
Realized gain |  | 0
Amortization of net origination fees | 486 | 2,460
Allowance for loan losses |  |
Beginning allowance | (62,149) | 0
Current period (allowance) reversal | 62,149 | (57,983)
Write offs |  | 0
Ending allowance | 0 | (62,149)
Ending balance | $ 52,684 | 874,349
Commercial Mortgage | Senior Securitized Mortgages | Cumulative effect of change in accounting principle for credit losses |  |
Allowance for loan losses |  |
Beginning allowance |  | $ (4,166)

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- Definition Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 6 -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
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- Definition The net increase(decrease) in interest income during the period representing the allocation of deferred loan origination fees less deferred loan origination costs using the effective interest method over the term of the debt arrangement to which they pertain taking into account the effect of prepayments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124402152&loc=d3e8622-111531 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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