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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021
Credit Reserve |  |
Beginning balance | $ 13 | $ 388
Sales, calls, other | 0 | 0
Ending Balance | 0 | 0
Unamortized Discount, Net |  |
Beginning balance |  | 95,718
Ending Balance | 90,216 | 90,216
Residential |  |
Credit Reserve |  |
Beginning balance | 44,947 | 44,967
Amortization of net discount | 0 | 0
Realized credit losses | (112) | (249)
Acquisitions | 890 | 2,825
Sales, calls, other | (718) | (992)
Transfers to (release of) credit reserves, net | (4,658) | (6,202)
Ending Balance | 40,349 | 40,349
Unamortized Discount, Net |  |
Beginning balance | 94,188 | 95,718
Amortization of net discount | (1,569) | (3,183)
Realized credit losses | 0 | 0
Acquisitions | 368 | 1,208
Sales, calls, other | (7,429) | (9,729)
Transfers to (release of) credit reserves, net | 4,658 | 6,202
Ending Balance | $ 90,216 | $ 90,216

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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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