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Fair Value - Level 3 Unobservable Inputs, Mortgage Loans and IRLC (Details)
$ in Thousands
Jun. 30, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
item
Excess servicing spread financing    
Loans held for sale | $ $ 3,586,810 $ 9,742,483
Level 3    
Excess servicing spread financing    
Loans held for sale | $ $ 503,553 $ 1,128,876
Mortgage loans held for sale | Discount rate | Level 3 | Minimum    
Excess servicing spread financing    
Input 3.3 2.2
Mortgage loans held for sale | Discount rate | Level 3 | Maximum    
Excess servicing spread financing    
Input 10.2 9.2
Mortgage loans held for sale | Discount rate | Level 3 | Weighted average    
Excess servicing spread financing    
Input 3.6 2.3
Mortgage loans held for sale | Twelve-month projected housing price index Change | Level 3 | Minimum    
Excess servicing spread financing    
Input 2.2 6.1
Mortgage loans held for sale | Twelve-month projected housing price index Change | Level 3 | Maximum    
Excess servicing spread financing    
Input 2.6 6.5
Mortgage loans held for sale | Twelve-month projected housing price index Change | Level 3 | Weighted average    
Excess servicing spread financing    
Input 2.4 6.2
Mortgage loans held for sale | Prepayment/resale speed | Level 3 | Minimum    
Excess servicing spread financing    
Input 4.7 0.4
Mortgage loans held for sale | Prepayment/resale speed | Level 3 | Maximum    
Excess servicing spread financing    
Input 28.6 30.3
Mortgage loans held for sale | Prepayment/resale speed | Level 3 | Weighted average    
Excess servicing spread financing    
Input 24.6 22.0
Mortgage loans held for sale | Total prepayment speed | Level 3 | Minimum    
Excess servicing spread financing    
Input 4.8 0.4
Mortgage loans held for sale | Total prepayment speed | Level 3 | Maximum    
Excess servicing spread financing    
Input 37.4 39.3
Mortgage loans held for sale | Total prepayment speed | Level 3 | Weighted average    
Excess servicing spread financing    
Input 31.2 28.2
Interest rate lock commitments | Level 3    
Excess servicing spread financing    
Loans held for sale | $ $ 65,151 $ 322,193
Interest rate lock commitments | Pull-through rate | Level 3 | Minimum    
Excess servicing spread financing    
Input 7.9 8.0
Interest rate lock commitments | Pull-through rate | Level 3 | Maximum    
Excess servicing spread financing    
Input 100 100
Interest rate lock commitments | Pull-through rate | Level 3 | Weighted average    
Excess servicing spread financing    
Input 84.3 78.4
Interest rate lock commitments | Mortgage servicing rights value expressed as servicing fee multiple | Level 3 | Minimum    
Excess servicing spread financing    
Input (3.2) (8.5)
Interest rate lock commitments | Mortgage servicing rights value expressed as servicing fee multiple | Level 3 | Maximum    
Excess servicing spread financing    
Input 7.0 6.7
Interest rate lock commitments | Mortgage servicing rights value expressed as servicing fee multiple | Level 3 | Weighted average    
Excess servicing spread financing    
Input 4.1 3.8
Interest rate lock commitments | Percentage of unpaid principal balance | Level 3 | Minimum    
Excess servicing spread financing    
Input (0.6) (1.6)
Interest rate lock commitments | Percentage of unpaid principal balance | Level 3 | Maximum    
Excess servicing spread financing    
Input 3.8 3.6
Interest rate lock commitments | Percentage of unpaid principal balance | Level 3 | Weighted average    
Excess servicing spread financing    
Input 1.8 1.5