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Mortgage Loan Servicing, Origination, and Loans Held for Sale - Mandatory cash forwards (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales    
Repurchase of principal balance $ 1,600,000 $ 7,700,000
Loan sales 859,900,000,000 1,600,000,000
Loan securitizations and loan sales $ 679,800,000,000 $ 1,200,000,000
Percentage of loan securitizations and loan sales 79.10% 76.70%
Loss reimbursement and settlement claims paid $ 8,000 $ 82,000
Loans held for sale $ 50,888,000 $ 28,968,000
Residential mortgage loans awaiting sale in secondary market | Minimum    
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales    
Loans held for sale, settlement period 15 days  
Residential mortgage loans awaiting sale in secondary market | Maximum    
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales    
Loans held for sale, settlement period 45 days