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Consolidated Agency Multifamily Loans - Product Types and Characteristics of Multifamily Loans (Details) - Multifamily securities
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 28 28
Total Principal $ 447,193 $ 455,168
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 $ 358,419 $ 364,811
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 $ 88,774 $ 90,357
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%