XML 99 R66.htm IDEA: XBRL DOCUMENT v3.25.1
Concentrations of Credit Risk - MF Risk Characteristics (Details)
3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serious delinquency, days past due 90 days  
Multifamily | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serious delinquency, days past due 60 days  
Multifamily | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serious delinquency, days past due 89 days  
Current debt service coverage ratio (higher risk loans) 1.0  
Multifamily | Guaranty Book of Business    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30 days delinquent (percentage of book of business) 0.17% 0.10%
Seriously delinquent (percentage of book of business) 0.63% 0.57%
Multifamily | Guaranty Book of Business | Original LTV ratio greater than 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 1.00% 1.00%
Loans seriously delinquent, percentage by unpaid principal balance 0.11% 0.12%
Multifamily | Guaranty Book of Business | Original LTV ratio less than or equal to 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 99.00% 99.00%
Loans seriously delinquent, percentage by unpaid principal balance 0.63% 0.58%
Multifamily | Guaranty Book of Business | Current DSCR below 1.0    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 5.00% 6.00%
Loans seriously delinquent, percentage by unpaid principal balance 5.38% 4.94%