XML 65 R52.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Residential Whole Loans - Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Jan. 01, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance | $ 44,102 | $ 54,261 | $ 63,244 | $ 86,833 | $ 106,246 | $ 136,589 | $ 218,011 | $ 3,025 | $ 86,833 |
Transition adjustment on adoption of ASU 2016-13 |  |  |  |  |  |  |  | 70,555 | 70,600 |
Current provision | (3,430) | (9,626) | (8,583) | (22,372) | (18,583) | (30,062) | (10,614) | 74,897 |  |
Write-offs | (1,225) | (533) | (400) | (1,217) | (830) | (281) | (627) | (647) | (3,373) |
Valuation adjustment on loans held for sale |  |  |  |  |  |  | (70,181) | 70,181 |  |
Ending balance | 39,447 | 44,102 | 54,261 | 63,244 | 86,833 | 106,246 | 136,589 | 218,011 | 39,447 |
Loans | 2,647,099 |  |  |  |  |  |  |  | 2,647,099 |
Allowance for credit loss | 39,447 | 44,102 | 54,261 | 63,244 | 86,833 | 106,246 | 136,589 | 218,011 | 39,447 |
Gross up of the amortized cost basis of Purchased Credit Deteriorated Loans |  |  |  |  |  |  |  |  | 62,400 |
2021 | 91,409 |  |  |  |  |  |  |  | 91,409 |
2020 | 376,866 |  |  |  |  |  |  |  | 376,866 |
2019 | 1,018,053 |  |  |  |  |  |  |  | 1,018,053 |
2018 | 453,900 |  |  |  |  |  |  |  | 453,900 |
2017 | 53,571 |  |  |  |  |  |  |  | 53,571 |
Prior | 653,300 |  |  |  |  |  |  |  | 653,300 |
Recoveries |  |  |  |  |  |  |  |  | 0 |
Net write-offs |  |  |  |  |  |  |  |  | 3,373 |
Gross write-offs, prior |  |  |  |  |  |  |  |  | 527 |
Net write-offs, prior |  |  |  |  |  |  |  |  | 527 |
Gross write-offs, 2017 |  |  |  |  |  |  |  |  | 123 |
Net write-offs, 2017 |  |  |  |  |  |  |  |  | 123 |
Gross write-offs, 2018 |  |  |  |  |  |  |  |  | 1,338 |
Net write-offs, 2018 |  |  |  |  |  |  |  |  | 1,338 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 1,385 |
Net write-offs, 2019 |  |  |  |  |  |  |  |  | 1,385 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Loans | 2,439,042 |  |  |  |  |  |  |  | 2,439,042 |
2021 | 88,639 |  |  |  |  |  |  |  | 88,639 |
2020 | 351,279 |  |  |  |  |  |  |  | 351,279 |
2019 | 1,000,821 |  |  |  |  |  |  |  | 1,000,821 |
2018 | 441,473 |  |  |  |  |  |  |  | 441,473 |
2017 | 49,985 |  |  |  |  |  |  |  | 49,985 |
Prior | 506,845 |  |  |  |  |  |  |  | 506,845 |
Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Loans | 208,057 |  |  |  |  |  |  |  | 208,057 |
2021 | 2,770 |  |  |  |  |  |  |  | 2,770 |
2020 | 25,587 |  |  |  |  |  |  |  | 25,587 |
2019 | 17,232 |  |  |  |  |  |  |  | 17,232 |
2018 | 12,427 |  |  |  |  |  |  |  | 12,427 |
2017 | 3,586 |  |  |  |  |  |  |  | 3,586 |
Prior | 146,455 |  |  |  |  |  |  |  | 146,455 |
Non-QM Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance | 9,689 | 12,092 | 14,545 | 21,068 | 26,753 | 31,353 | 103,831 | 388 | 21,068 |
Transition adjustment on adoption of ASU 2016-13 |  |  |  |  |  |  |  | 6,904 |  |
Current provision | (1,400) | (2,403) | (2,416) | (6,523) | (5,599) | (4,568) | (2,297) | 26,358 |  |
Write-offs | 0 | 0 | (37) | 0 | (86) | (32) | 0 | 0 |  |
Valuation adjustment on loans held for sale |  |  |  |  |  |  | (70,181) | 70,181 |  |
Ending balance | 8,289 | 9,689 | 12,092 | 14,545 | 21,068 | 26,753 | 31,353 | 103,831 | 8,289 |
Allowance for credit loss | 8,289 | 9,689 | 12,092 | 14,545 | 21,068 | 26,753 | 31,353 | 103,831 | 8,289 |
Rehabilitation loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance | 8,685 | 11,604 | 13,668 | 18,371 | 22,633 | 30,000 | 35,633 | 2,331 | 18,371 |
Transition adjustment on adoption of ASU 2016-13 |  |  |  |  |  |  |  | 517 |  |
Current provision | (706) | (2,526) | (1,809) | (3,700) | (3,837) | (7,140) | (5,213) | 33,213 |  |
Write-offs | (1,098) | (393) | (255) | (1,003) | (425) | (227) | (420) | (428) |  |
Valuation adjustment on loans held for sale |  |  |  |  |  |  | 0 | 0 |  |
Ending balance | 6,881 | 8,685 | 11,604 | 13,668 | 18,371 | 22,633 | 30,000 | 35,633 | 6,881 |
Loans | 87,000 |  |  |  | 143,400 |  |  |  | 87,000 |
Allowance for credit loss | 6,881 | 8,685 | 11,604 | 13,668 | 18,371 | 22,633 | 30,000 | 35,633 | 6,881 |
Single-family rental loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance | 1,634 | 2,360 | 2,746 | 3,918 | 5,025 | 6,931 | 7,431 | 62 | 3,918 |
Transition adjustment on adoption of ASU 2016-13 |  |  |  |  |  |  |  | 754 |  |
Current provision | (178) | (670) | (386) | (1,172) | (1,107) | (1,906) | (500) | 6,615 |  |
Write-offs | (5) | (56) | 0 | 0 | 0 | 0 | 0 | 0 |  |
Valuation adjustment on loans held for sale |  |  |  |  |  |  | 0 | 0 |  |
Ending balance | 1,451 | 1,634 | 2,360 | 2,746 | 3,918 | 5,025 | 6,931 | 7,431 | 1,451 |
Allowance for credit loss | 1,451 | 1,634 | 2,360 | 2,746 | 3,918 | 5,025 | 6,931 | 7,431 | 1,451 |
Seasoned Performing Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance | 50 | 57 | 66 | 107 | 150 | 224 | 249 | 0 | 107 |
Transition adjustment on adoption of ASU 2016-13 |  |  |  |  |  |  |  | 19 |  |
Current provision | (4) | (7) | (9) | (41) | (43) | (74) | (25) | 230 |  |
Write-offs | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  |
Valuation adjustment on loans held for sale |  |  |  |  |  |  | 0 | 0 |  |
Ending balance | 46 | 50 | 57 | 66 | 107 | 150 | 224 | 249 | 46 |
Allowance for credit loss | 46 | 50 | 57 | 66 | 107 | 150 | 224 | 249 | 46 |
Purchased Credit Deteriorated Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance | 24,044 | 28,148 | 32,219 | 43,369 | 51,685 | 68,081 | 70,867 | 244 | 43,369 |
Transition adjustment on adoption of ASU 2016-13 |  |  |  |  |  |  |  | 62,361 |  |
Current provision | (1,142) | (4,020) | (3,963) | (10,936) | (7,997) | (16,374) | (2,579) | 8,481 |  |
Write-offs | (122) | (84) | (108) | (214) | (319) | (22) | (207) | (219) |  |
Valuation adjustment on loans held for sale |  |  |  |  |  |  | 0 | 0 |  |
Ending balance | 22,780 | 24,044 | 28,148 | 32,219 | 43,369 | 51,685 | 68,081 | 70,867 | 22,780 |
Loans | 57,400 |  |  |  | 72,700 |  |  |  | 57,400 |
Allowance for credit loss | 22,780 | $ 24,044 | $ 28,148 | 32,219 | 43,369 | $ 51,685 | $ 68,081 | $ 70,867 | 22,780 |
Unfunded Loan Commitment |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 1,200 |  |  |  |  | 1,200 |
Ending balance | 205 |  |  |  | 1,200 |  |  |  | 205 |
Commitment to lend, unfunded | 18,500 |  |  |  | 73,200 |  |  |  | 18,500 |
Allowance for credit loss | 205 |  |  |  | 1,200 |  |  |  | 205 |
Non-QM Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Write-offs |  |  |  |  |  |  |  |  | (37) |
Loans | 1,448,162 |  |  |  |  |  |  |  | 1,448,162 |
2021 | 63,211 |  |  |  |  |  |  |  | 63,211 |
2020 | 315,911 |  |  |  |  |  |  |  | 315,911 |
2019 | 673,422 |  |  |  |  |  |  |  | 673,422 |
2018 | 353,795 |  |  |  |  |  |  |  | 353,795 |
2017 | 37,719 |  |  |  |  |  |  |  | 37,719 |
Prior | 4,104 |  |  |  |  |  |  |  | 4,104 |
Recoveries |  |  |  |  |  |  |  |  | 0 |
Net write-offs |  |  |  |  |  |  |  |  | 37 |
Gross write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Net write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2017 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2017 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2018 |  |  |  |  |  |  |  |  | 37 |
Net write-offs, 2018 |  |  |  |  |  |  |  |  | 37 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2019 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Non-QM Loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Loans | 1,395,572 |  |  |  |  |  |  |  | 1,395,572 |
2021 | 60,441 |  |  |  |  |  |  |  | 60,441 |
2020 | 290,836 |  |  |  |  |  |  |  | 290,836 |
2019 | 662,258 |  |  |  |  |  |  |  | 662,258 |
2018 | 342,250 |  |  |  |  |  |  |  | 342,250 |
2017 | 35,833 |  |  |  |  |  |  |  | 35,833 |
Prior | 3,954 |  |  |  |  |  |  |  | 3,954 |
Non-QM Loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Loans | 52,590 |  |  |  |  |  |  |  | 52,590 |
2021 | 2,770 |  |  |  |  |  |  |  | 2,770 |
2020 | 25,075 |  |  |  |  |  |  |  | 25,075 |
2019 | 11,164 |  |  |  |  |  |  |  | 11,164 |
2018 | 11,545 |  |  |  |  |  |  |  | 11,545 |
2017 | 1,886 |  |  |  |  |  |  |  | 1,886 |
Prior | 150 |  |  |  |  |  |  |  | 150 |
Rehabilitation loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Write-offs |  |  |  |  |  |  |  |  | (2,748) |
Loans | 217,315 |  |  |  |  |  |  |  | 217,315 |
2021 | 12,754 |  |  |  |  |  |  |  | 12,754 |
2020 | 24,716 |  |  |  |  |  |  |  | 24,716 |
2019 | 152,388 |  |  |  |  |  |  |  | 152,388 |
2018 | 22,330 |  |  |  |  |  |  |  | 22,330 |
2017 | 5,127 |  |  |  |  |  |  |  | 5,127 |
Prior | 0 |  |  |  |  |  |  |  | 0 |
Recoveries |  |  |  |  |  |  |  |  | 0 |
Net write-offs |  |  |  |  |  |  |  |  | 2,748 |
Gross write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Net write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2017 |  |  |  |  |  |  |  |  | 123 |
Net write-offs, 2017 |  |  |  |  |  |  |  |  | 123 |
Gross write-offs, 2018 |  |  |  |  |  |  |  |  | 1,296 |
Net write-offs, 2018 |  |  |  |  |  |  |  |  | 1,296 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 1,329 |
Net write-offs, 2019 |  |  |  |  |  |  |  |  | 1,329 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Rehabilitation loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Loans | 214,063 |  |  |  |  |  |  |  | 214,063 |
2021 | 12,754 |  |  |  |  |  |  |  | 12,754 |
2020 | 24,716 |  |  |  |  |  |  |  | 24,716 |
2019 | 151,632 |  |  |  |  |  |  |  | 151,632 |
2018 | 21,534 |  |  |  |  |  |  |  | 21,534 |
2017 | 3,427 |  |  |  |  |  |  |  | 3,427 |
Prior | 0 |  |  |  |  |  |  |  | 0 |
Rehabilitation loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Loans | 3,252 |  |  |  |  |  |  |  | 3,252 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 756 |  |  |  |  |  |  |  | 756 |
2018 | 796 |  |  |  |  |  |  |  | 796 |
2017 | 1,700 |  |  |  |  |  |  |  | 1,700 |
Prior | 0 |  |  |  |  |  |  |  | 0 |
Single-family rental loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Write-offs |  |  |  |  |  |  |  |  | (61) |
Loans | 331,808 |  |  |  |  |  |  |  | 331,808 |
2021 | 15,444 |  |  |  |  |  |  |  | 15,444 |
2020 | 36,239 |  |  |  |  |  |  |  | 36,239 |
2019 | 192,243 |  |  |  |  |  |  |  | 192,243 |
2018 | 77,775 |  |  |  |  |  |  |  | 77,775 |
2017 | 10,107 |  |  |  |  |  |  |  | 10,107 |
Prior | 0 |  |  |  |  |  |  |  | 0 |
Recoveries |  |  |  |  |  |  |  |  | 0 |
Net write-offs |  |  |  |  |  |  |  |  | 61 |
Gross write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Net write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2017 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2017 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2018 |  |  |  |  |  |  |  |  | 5 |
Net write-offs, 2018 |  |  |  |  |  |  |  |  | 5 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 56 |
Net write-offs, 2019 |  |  |  |  |  |  |  |  | 56 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Single-family rental loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Loans | 325,898 |  |  |  |  |  |  |  | 325,898 |
2021 | 15,444 |  |  |  |  |  |  |  | 15,444 |
2020 | 35,727 |  |  |  |  |  |  |  | 35,727 |
2019 | 186,931 |  |  |  |  |  |  |  | 186,931 |
2018 | 77,689 |  |  |  |  |  |  |  | 77,689 |
2017 | 10,107 |  |  |  |  |  |  |  | 10,107 |
Prior | 0 |  |  |  |  |  |  |  | 0 |
Single-family rental loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Loans | 5,910 |  |  |  |  |  |  |  | 5,910 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 512 |  |  |  |  |  |  |  | 512 |
2019 | 5,312 |  |  |  |  |  |  |  | 5,312 |
2018 | 86 |  |  |  |  |  |  |  | 86 |
2017 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 0 |  |  |  |  |  |  |  | 0 |
Seasoned Performing Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Write-offs |  |  |  |  |  |  |  |  | 0 |
Loans | 102,042 |  |  |  |  |  |  |  | 102,042 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
2018 | 0 |  |  |  |  |  |  |  | 0 |
2017 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 102,042 |  |  |  |  |  |  |  | 102,042 |
Recoveries |  |  |  |  |  |  |  |  | 0 |
Net write-offs |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Net write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2017 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2017 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2018 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2018 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2019 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Seasoned Performing Loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Loans | 98,288 |  |  |  |  |  |  |  | 98,288 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
2018 | 0 |  |  |  |  |  |  |  | 0 |
2017 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 98,288 |  |  |  |  |  |  |  | 98,288 |
Seasoned Performing Loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Loans | 3,754 |  |  |  |  |  |  |  | 3,754 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
2018 | 0 |  |  |  |  |  |  |  | 0 |
2017 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 3,754 |  |  |  |  |  |  |  | 3,754 |
Purchased Credit Deteriorated Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Write-offs |  |  |  |  |  |  |  |  | (527) |
Loans | 547,772 |  |  |  | $ 673,708 |  |  |  | 547,772 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
2018 | 0 |  |  |  |  |  |  |  | 0 |
2017 | 618 |  |  |  |  |  |  |  | 618 |
Prior | 547,154 |  |  |  |  |  |  |  | 547,154 |
Recoveries |  |  |  |  |  |  |  |  | 0 |
Net write-offs |  |  |  |  |  |  |  |  | 527 |
Gross write-offs, prior |  |  |  |  |  |  |  |  | 527 |
Net write-offs, prior |  |  |  |  |  |  |  |  | 527 |
Gross write-offs, 2017 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2017 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2018 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2018 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2019 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Purchased Credit Deteriorated Loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Loans | 405,221 |  |  |  |  |  |  |  | 405,221 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
2018 | 0 |  |  |  |  |  |  |  | 0 |
2017 | 618 |  |  |  |  |  |  |  | 618 |
Prior | 404,603 |  |  |  |  |  |  |  | 404,603 |
Purchased Credit Deteriorated Loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Loans | 142,551 |  |  |  |  |  |  |  | 142,551 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
2018 | 0 |  |  |  |  |  |  |  | 0 |
2017 | 0 |  |  |  |  |  |  |  | 0 |
Prior | $ 142,551 |  |  |  |  |  |  |  | $ 142,551 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Allowance for credit loss |  |  |  |  |  |  |  |  |  | $ 8,300

X
- Definition Financing Receivable, Allowance For Credit Loss, Adoption Of New Accounting Principle + References No definition available. + Details
Name: | mfa_FinancingReceivableAllowanceForCreditLossAdoptionOfNewAccountingPrinciple
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Gross Up of Amortized Cost Of Purchased Credit Deteriorated Loans + References No definition available. + Details
Name: | mfa_FinancingReceivableGrossUpOfAmortizedCostOfPurchasedCreditDeterioratedLoans
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Originated Five Or More Years Before Latest Fiscal Year, Gross Write-Offs + References No definition available. + Details
Name: | mfa_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYearGrossWriteOffs
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Originated Five Or More Years Before Latest Fiscal Year, Net Write-Offs + References No definition available. + Details
Name: | mfa_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYearNetWriteOffs
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Originated Four Years Before Latest Fiscal Year, Gross Write-Offs + References No definition available. + Details
Name: | mfa_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYearGrossWriteOffs
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Originated Four Years Before Latest Fiscal Year, Net Write-Offs + References No definition available. + Details
Name: | mfa_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYearNetWriteOffs
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Originated In Fiscal Year Before Fiscal Year, Gross Write-Offs + References No definition available. + Details
Name: | mfa_FinancingReceivableOriginatedInFiscalYearBeforeFiscalYearGrossWriteOffs
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Originated In Fiscal Year Before Latest Fiscal Year, Net Write-Offs + References No definition available. + Details
Name: | mfa_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYearNetWriteOffs
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Originated Three Years Before Latest Fiscal Year, Gross Write-Offs + References No definition available. + Details
Name: | mfa_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYearGrossWriteOffs
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Originated Three Years Before Latest Fiscal Year, Net Write-Offs + References No definition available. + Details
Name: | mfa_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYearNetWriteOffs
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Originated Two Years Before Latest Fiscal Year, Gross Write-Offs + References No definition available. + Details
Name: | mfa_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYearGrossWriteOffs
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Originated Two Years Before Latest Fiscal Year, Net Write-Offs + References No definition available. + Details
Name: | mfa_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYearNetWriteOffs
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Valuation Allowance Adjustment + References No definition available. + Details
Name: | mfa_FinancingReceivableValuationAllowanceAdjustment
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (4) + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of financing receivable originated more than five years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated four years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated in fiscal year prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated three years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated two years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554 + Details
Name: | us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1404 -Paragraph (a) + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
Name: | us-gaap_ProvisionForLoanLossesExpensed
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LoanToValueAxis=us-gaap_LtvLessThan80PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanToValueAxis=us-gaap_Ltv80To100PercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mfa_NonQMLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mfa_RehabilitationLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mfa_SingleFamilyRentalLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mfa_SeasonedPerformingLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mfa_PurchasedCreditDeterioratedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_UnfundedLoanCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mfa_NonQMLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mfa_RehabilitationLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mfa_SingleFamilyRentalLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mfa_SeasonedPerformingLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mfa_PurchasedCreditDeterioratedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |