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Multifamily Loans - Product Types and Characteristics of Multifamily Loans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 198 | 669
Total Principal | $ 172,748 | $ 524,928
30-89 Days DQ | 3,362 | 1,650
90+ Days DQ | $ 1,882 | $ 747
Multifamily securities |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | loan | 28 | 279
Total Principal | $ 462,808 | $ 4,195,000
30-89 Days DQ | 0 | 0
90+ Days DQ | 0 | 0
Multifamily securities | $1,000 to $10,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum |  | 1,000
Loan Balance, maximum |  | $ 10,000
Number of Loans | loan |  | 114
Total Principal |  | $ 674,666
30-89 Days DQ |  | 0
90+ Days DQ |  | $ 0
Multifamily securities | $1,000 to $10,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate |  | 3.29%
Multifamily securities | $1,000 to $10,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate |  | 4.73%
Multifamily securities | $10,001 to $20,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum | 10,001 | $ 10,001
Loan Balance, maximum | $ 20,000 | $ 20,000
Number of Loans | loan | 24 | 102
Total Principal | $ 370,934 | $ 1,489,118
30-89 Days DQ | 0 | 0
90+ Days DQ | $ 0 | $ 0
Multifamily securities | $10,001 to $20,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 4.25% | 3.54%
Multifamily securities | $10,001 to $20,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 4.25% | 4.94%
Multifamily securities | $20,001 to $30,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum | $ 20,001 | $ 20,001
Loan Balance, maximum | $ 30,000 | $ 30,000
Number of Loans | loan | 4 | 32
Total Principal | $ 91,874 | $ 750,712
30-89 Days DQ | 0 | 0
90+ Days DQ | $ 0 | $ 0
Multifamily securities | $20,001 to $30,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 4.25% | 3.54%
Multifamily securities | $20,001 to $30,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 4.25% | 4.69%
Multifamily securities | $30,001 to $40,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, minimum |  | $ 30,001
Loan Balance, maximum |  | $ 40,000
Number of Loans | loan |  | 19
Total Principal |  | $ 654,729
30-89 Days DQ |  | 0
90+ Days DQ |  | $ 0
Multifamily securities | $30,001 to $40,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate |  | 3.52%
Multifamily securities | $30,001 to $40,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate |  | 4.79%
Multifamily securities | Over $40,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan Balance, maximum |  | $ 40,000
Number of Loans | loan |  | 12
Total Principal |  | $ 625,775
30-89 Days DQ |  | 0
90+ Days DQ |  | $ 0
Multifamily securities | Over $40,000 | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate |  | 3.55%
Multifamily securities | Over $40,000 | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate |  | 4.65%

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