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Multifamily Loans - Product Types and Characteristics of Multifamily Loans (Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | loan |  |  | 669 | 1,484
Total Principal | $ 524,928 | $ 1,034,284 | $ 524,928 | $ 1,034,284
30-89 Days DQ | 1,650 | 559 | 1,650 | 559
90 Days DQ | $ 747 | $ 747 | $ 747 | $ 747
Multifamily loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | loan | 279 | 162 | 279 | 162
Total Principal | $ 4,195,000 | $ 2,126,698 | $ 4,195,000 | $ 2,126,698
30-89 Days DQ | 0 | 0 | 0 | 0
90 Days DQ | 0 | 0 | 0 | 0
Multifamily loans | $1,000 to $10,000 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance, minimum | 1,000 | 1,000 | 1,000 | 1,000
Loan Balance, maximum | 10,000 | 10,000 | $ 10,000 | $ 10,000
Number of Loans | loan |  |  | 114 | 70
Total Principal | 674,666 | 394,373 | $ 674,666 | $ 394,373
30-89 Days DQ | 0 | 0 | 0 | 0
90 Days DQ | 0 | 0 | $ 0 | $ 0
Multifamily loans | $1,000 to $10,000 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 3.29% | 3.29%
Multifamily loans | $1,000 to $10,000 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 4.73% | 4.73%
Multifamily loans | $10,001 to $20,000 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance, minimum | 10,001 | 10,001 | $ 10,001 | $ 10,001
Loan Balance, maximum | 20,000 | 20,000 | $ 20,000 | $ 20,000
Number of Loans | loan |  |  | 102 | 66
Total Principal | 1,489,118 | 960,992 | $ 1,489,118 | $ 960,992
30-89 Days DQ | 0 | 0 | 0 | 0
90 Days DQ | 0 | 0 | $ 0 | $ 0
Multifamily loans | $10,001 to $20,000 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 3.54% | 3.54%
Multifamily loans | $10,001 to $20,000 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 4.94% | 4.61%
Multifamily loans | $20,001 to $30,000 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance, minimum | 20,001 | 20,001 | $ 20,001 | $ 20,001
Loan Balance, maximum | 30,000 | 30,000 | $ 30,000 | $ 30,000
Number of Loans | loan |  |  | 32 | 16
Total Principal | 750,712 | 373,036 | $ 750,712 | $ 373,036
30-89 Days DQ | 0 | 0 | 0 | 0
90 Days DQ | 0 | 0 | $ 0 | $ 0
Multifamily loans | $20,001 to $30,000 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 3.54% | 3.65%
Multifamily loans | $20,001 to $30,000 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 4.69% | 4.72%
Multifamily loans | $30,001 to $40,000 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance, minimum | 30,001 | 30,001 | $ 30,001 | $ 30,001
Loan Balance, maximum | 40,000 | 40,000 | $ 40,000 | $ 40,000
Number of Loans | loan |  |  | 19 | 7
Total Principal | 654,729 | 244,074 | $ 654,729 | $ 244,074
30-89 Days DQ | 0 | 0 | 0 | 0
90 Days DQ | 0 | 0 | $ 0 | $ 0
Multifamily loans | $30,001 to $40,000 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 3.52% | 3.62%
Multifamily loans | $30,001 to $40,000 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 4.79% | 4.71%
Multifamily loans | Over $40,000 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Balance, maximum | 40,000 | 40,000 | $ 40,000 | $ 40,000
Number of Loans | loan |  |  | 12 | 3
Total Principal | 625,775 | 154,223 | $ 625,775 | $ 154,223
30-89 Days DQ | 0 | 0 | 0 | 0
90 Days DQ | $ 0 | $ 0 | $ 0 | $ 0
Multifamily loans | Over $40,000 | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 3.55% | 3.74%
Multifamily loans | Over $40,000 | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Rate |  |  | 4.65% | 4.18%

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