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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021
Credit Reserve |  |
Beginning balance | $ 0 | $ 388
Sales, calls, other | 0 | 0
Ending Balance | 0 | 0
Unamortized Discount, Net |  |
Beginning balance |  | 95,718
Ending Balance | 88,108 | 88,108
Residential |  |
Credit Reserve |  |
Beginning balance | 40,349 | 44,967
Amortization of net discount | 0 | 0
Realized credit losses | (184) | (433)
Acquisitions | 0 | 2,825
Sales, calls, other | (320) | (1,312)
Transfers to (release of) credit reserves, net | (10,397) | (16,599)
Ending Balance | 29,448 | 29,448
Unamortized Discount, Net |  |
Beginning balance | 90,216 | 95,718
Amortization of net discount | (6,437) | (9,620)
Realized credit losses | 0 | 0
Acquisitions | 0 | 1,208
Sales, calls, other | (6,068) | (15,797)
Transfers to (release of) credit reserves, net | 10,397 | 16,599
Ending Balance | $ 88,108 | $ 88,108

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- Definition Changes to the net unamortized discount on available-for-sale securities due to sales, calls, and other items. + References No definition available. + Details
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- Definition Transfers to or releases of the credit reserve on available-for-sale securities. + References No definition available. + Details
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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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