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Loans Held-for-Sale, Net - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Sale of loans held-for-sale excluding acquired loans   $ 4,890,000,000 $ 5,440,000,000 $ 6,420,000,000
Amount of securitizations     43,400,000 85,700,000
Unrealized impairment loss   (1,989,000) (15,703,000)  
Loans held-for-sale, nonaccrual   0 0  
Greater Than 90 Days Past Due        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held-for-sale 90 or more days past due   $ 0 0  
US Government Sponsored-Enterprise Insured Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Period of loans held for sale sold   60 days    
Private Label        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Period of loans held for sale sold   180 days    
Sale of loans held-for-sale excluding acquired loans     $ 489,300,000 $ 985,100,000
Gain on sale of financing receivable $ 900,000