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Multifamily Loans - Product Types and Characteristics of Multifamily Loans (Details) - Multifamily securities $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 28 | 28
Total Principal | $ 455,168 | $ 462,808
30-89 Days DQ | 0 | 0
90+ Days DQ | $ 0 | 0
$10,001 to $20,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum |  | 10,001
Loan Balance, maximum |  | $ 20,000
Number of Loans | loan | 24 | 24
Total Principal | $ 364,811 | $ 370,934
30-89 Days DQ | 0 | 0
90+ Days DQ | $ 0 | $ 0
$10,001 to $20,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 4.25% | 4.25%
$10,001 to $20,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 4.25% | 4.25%
$20,001 to $30,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum |  | $ 20,001
Loan Balance, maximum |  | $ 30,000
Number of Loans | loan | 4 | 4
Total Principal | $ 90,357 | $ 91,874
30-89 Days DQ | 0 | 0
90+ Days DQ | $ 0 | $ 0
$20,001 to $30,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 4.25% | 4.25%
$20,001 to $30,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 4.25% | 4.25%

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- Definition Amount of principal due on loans that have been delinquent thirty to eighty-nine days as of the balance sheet date. + References No definition available. + Details
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- Definition Interest rate of mortgage loan within 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -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(Column B)) -URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
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- Definition This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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