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Residential Whole Loans - Additional Credit Related Information (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 | Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
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 |
Residential whole loans, total or weighted average | 2,647,099 |  |  |  |  |  |  |  | 2,647,099 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 1,385 |
Gross write-offs |  |  |  |  |  |  |  |  | 1,338 |
Gross write-offs, prior |  |  |  |  |  |  |  |  | 527 |
Nine Months Ended September 30, 2021 Gross write-offs | 1,225 | $ 533 | $ 400 | $ 1,217 | $ 830 | $ 281 | $ 627 | $ 647 | 3,373 |
Net write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2019 |  |  |  |  |  |  |  |  | 1,385 |
Net write-offs, 2018 |  |  |  |  |  |  |  |  | 1,338 |
Net write-offs, prior |  |  |  |  |  |  |  |  | 527 |
Nine Months Ended September 30, 2021 Net write-offs |  |  |  |  |  |  |  |  | $ 3,373 |
Weighted Average LTV Ratio |  |  |  |  |  |  |  |  | 80.00% |
Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
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 |
Residential whole loans, total or weighted average | 2,439,042 |  |  |  |  |  |  |  | 2,439,042 |
Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
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 |
Residential whole loans, total or weighted average | 208,057 |  |  |  |  |  |  |  | 208,057 |
Non-QM Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
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 |
Residential whole loans, total or weighted average | 1,448,162 |  |  |  |  |  |  |  | 1,448,162 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs |  |  |  |  |  |  |  |  | 37 |
Gross write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Nine Months Ended September 30, 2021 Gross write-offs |  |  |  |  |  |  |  |  | 37 |
Net write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2019 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2018 |  |  |  |  |  |  |  |  | 37 |
Net write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Nine Months Ended September 30, 2021 Net write-offs |  |  |  |  |  |  |  |  | 37 |
Non-QM Loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
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 |
Residential whole loans, total or weighted average | 1,395,572 |  |  |  |  |  |  |  | 1,395,572 |
Non-QM Loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
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 |
Residential whole loans, total or weighted average | 52,590 |  |  |  |  |  |  |  | 52,590 |
Rehabilitation loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
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 |
Residential whole loans, total or weighted average | 217,315 |  |  |  |  |  |  |  | 217,315 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 1,329 |
Gross write-offs |  |  |  |  |  |  |  |  | 1,296 |
Gross write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Nine Months Ended September 30, 2021 Gross write-offs |  |  |  |  |  |  |  |  | 2,748 |
Net write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2019 |  |  |  |  |  |  |  |  | 1,329 |
Net write-offs, 2018 |  |  |  |  |  |  |  |  | 1,296 |
Net write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Nine Months Ended September 30, 2021 Net write-offs |  |  |  |  |  |  |  |  | 2,748 |
Rehabilitation loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
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 |
Residential whole loans, total or weighted average | 214,063 |  |  |  |  |  |  |  | 214,063 |
Rehabilitation loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 756 |  |  |  |  |  |  |  | 756 |
2018 | 796 |  |  |  |  |  |  |  | 796 |
2017 | 1,700 |  |  |  |  |  |  |  | 1,700 |
Prior | 0 |  |  |  |  |  |  |  | 0 |
Residential whole loans, total or weighted average | 3,252 |  |  |  |  |  |  |  | 3,252 |
Single-family rental loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
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 |
Residential whole loans, total or weighted average | 331,808 |  |  |  |  |  |  |  | 331,808 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 56 |
Gross write-offs |  |  |  |  |  |  |  |  | 5 |
Gross write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Nine Months Ended September 30, 2021 Gross write-offs |  |  |  |  |  |  |  |  | 61 |
Net write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2019 |  |  |  |  |  |  |  |  | 56 |
Net write-offs, 2018 |  |  |  |  |  |  |  |  | 5 |
Net write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Nine Months Ended September 30, 2021 Net write-offs |  |  |  |  |  |  |  |  | 61 |
Single-family rental loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
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 |
Residential whole loans, total or weighted average | 325,898 |  |  |  |  |  |  |  | 325,898 |
Single-family rental loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 512 |  |  |  |  |  |  |  | 512 |
2019 | 5,312 |  |  |  |  |  |  |  | 5,312 |
2018 | 86 |  |  |  |  |  |  |  | 86 |
2017 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 0 |  |  |  |  |  |  |  | 0 |
Residential whole loans, total or weighted average | 5,910 |  |  |  |  |  |  |  | 5,910 |
Seasoned Performing Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
2018 | 0 |  |  |  |  |  |  |  | 0 |
2017 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 102,042 |  |  |  |  |  |  |  | 102,042 |
Residential whole loans, total or weighted average | 102,042 |  |  |  |  |  |  |  | 102,042 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Nine Months Ended September 30, 2021 Gross write-offs |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2019 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2018 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, prior |  |  |  |  |  |  |  |  | 0 |
Nine Months Ended September 30, 2021 Net write-offs |  |  |  |  |  |  |  |  | 0 |
Seasoned Performing Loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
2018 | 0 |  |  |  |  |  |  |  | 0 |
2017 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 98,288 |  |  |  |  |  |  |  | 98,288 |
Residential whole loans, total or weighted average | 98,288 |  |  |  |  |  |  |  | 98,288 |
Seasoned Performing Loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
2018 | 0 |  |  |  |  |  |  |  | 0 |
2017 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 3,754 |  |  |  |  |  |  |  | 3,754 |
Residential whole loans, total or weighted average | 3,754 |  |  |  |  |  |  |  | 3,754 |
Purchased Credit Deteriorated Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
2018 | 0 |  |  |  |  |  |  |  | 0 |
2017 | 618 |  |  |  |  |  |  |  | 618 |
Prior | 547,154 |  |  |  |  |  |  |  | 547,154 |
Residential whole loans, total or weighted average | 547,772 |  |  |  | 673,708 |  |  |  | 547,772 | $ 673,708
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, prior |  |  |  |  |  |  |  |  | 527 |
Nine Months Ended September 30, 2021 Gross write-offs |  |  |  |  |  |  |  |  | 527 |
Net write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2019 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, 2018 |  |  |  |  |  |  |  |  | 0 |
Net write-offs, prior |  |  |  |  |  |  |  |  | 527 |
Nine Months Ended September 30, 2021 Net write-offs |  |  |  |  |  |  |  |  | 527 |
Purchased Credit Deteriorated Loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
2018 | 0 |  |  |  |  |  |  |  | 0 |
2017 | 618 |  |  |  |  |  |  |  | 618 |
Prior | 404,603 |  |  |  |  |  |  |  | 404,603 |
Residential whole loans, total or weighted average | 405,221 |  |  |  |  |  |  |  | 405,221 |
Purchased Credit Deteriorated Loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
2018 | 0 |  |  |  |  |  |  |  | 0 |
2017 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 142,551 |  |  |  |  |  |  |  | 142,551 |
Residential whole loans, total or weighted average | 142,551 |  |  |  |  |  |  |  | 142,551 |
Settled Whole Loans | Non-QM Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased performing loans | 3,453,242 |  |  |  | 2,336,117 |  |  |  | $ 3,453,242 | $ 2,336,117
Weighted Average LTV Ratio |  |  |  |  |  |  |  |  | 66.00% | 64.00%
Settled Whole Loans | Rehabilitation loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased performing loans | 727,964 |  |  |  | 563,430 |  |  |  | $ 727,964 | $ 563,430
Weighted Average LTV Ratio |  |  |  |  |  |  |  |  | 67.00% | 63.00%
Settled Whole Loans | Single-family rental loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased performing loans | 949,772 |  |  |  | 442,456 |  |  |  | $ 949,772 | $ 442,456
Weighted Average LTV Ratio |  |  |  |  |  |  |  |  | 70.00% | 70.00%
Settled Whole Loans | Seasoned Performing Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased performing loans | 101,995 |  |  |  | 136,157 |  |  |  | $ 101,995 | $ 136,157
Weighted Average LTV Ratio |  |  |  |  |  |  |  |  | 37.00% | 40.00%
Settled Whole Loans | Certain rehabilitation loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased performing loans | $ 137,300 |  |  |  | $ 189,900 |  |  |  | $ 137,300 | $ 189,900
Weighted Average LTV Ratio |  |  |  |  |  |  |  |  | 71.00% | 69.00%

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

X
- Definition The LTV of which the Company has assessed its residential whole loans at carrying value will have a higher likelihood of default than newly originated mortgage loans + References No definition available. + Details
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