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Fair Value Measurements - Valuation Techniques and Unobservable Inputs Related to Level 3 Assets (Details)
$ in Thousands
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 5,655,583 $ 4,872,017
Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 5,504,871 4,742,898
Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 150,712 129,119
Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 5,655,465 4,871,951
Level 3 | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 5,504,753 4,742,832
Level 3 | Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 150,712 $ 129,119
Level 3 | Valuation, Market Approach | Measurement Input Selling Cost | Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Individually evaluated loans requiring specific allowance, net 0.08 0.08
Real estate owned, net 0.08 0.08
Level 3 | Discounted Cash Flow | Discount rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.078 0.076
Level 3 | Minimum | Discounted Cash Flow | Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0 0
Level 3 | Minimum | Discounted Cash Flow | Default Rate [Member] | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.006 0.004
Level 3 | Minimum | Discounted Cash Flow | Loss Severity Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0 0
Level 3 | Maximum | Discounted Cash Flow | Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.65 0.65
Level 3 | Maximum | Discounted Cash Flow | Default Rate [Member] | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.063 0.06
Level 3 | Maximum | Discounted Cash Flow | Loss Severity Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.228 0.087
Level 3 | Weighted Average | Valuation, Market Approach | Measurement Input Selling Cost | Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Individually evaluated loans requiring specific allowance, net 0.08 [1] 0.08 [2]
Real estate owned, net 0.08 [1] 0.08 [2]
Level 3 | Weighted Average | Discounted Cash Flow | Discount rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.078 [1] 0.076 [2]
Level 3 | Weighted Average | Discounted Cash Flow | Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.11 [1] 0.12 [2]
Level 3 | Weighted Average | Discounted Cash Flow | Default Rate [Member] | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.014 [1] 0.01 [2]
Level 3 | Weighted Average | Discounted Cash Flow | Loss Severity Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.093 [1] 0.01 [2]
Level 3 | Real Estate Owned, Net | Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 142,085 $ 118,289
Level 3 | Individually evaluated loans requiring allowance net | Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 8,627 10,830
Level 3 | Loans Held for Investment | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 5,460,522 4,729,869
Level 3 | Retained Securities, at Fair Value | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 29,924  
Level 3 | Retained Securities, at Fair Value | Discounted Cash Flow | Discount rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Retained securities measurement input 0.12  
Level 3 | Retained Securities, at Fair Value | Minimum | Discounted Cash Flow | Monthly liquidation rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Retained securities measurement input 0.005  
Level 3 | Retained Securities, at Fair Value | Maximum | Discounted Cash Flow | Monthly liquidation rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Retained securities measurement input 0.026  
Level 3 | Retained Securities, at Fair Value | Weighted Average | Discounted Cash Flow | Discount rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Retained securities measurement input [1] 0.12  
Level 3 | Retained Securities, at Fair Value | Weighted Average | Discounted Cash Flow | Monthly liquidation rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Retained securities measurement input [1] 0.012  
Level 3 | Mortgage servicing rights - GNMA loans | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 14,160 $ 12,748
Level 3 | Mortgage servicing rights - GNMA loans | Discounted Cash Flow | Discount rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value   0.08
Level 3 | Mortgage servicing rights - GNMA loans | Minimum | Discounted Cash Flow | Discount rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.08  
Level 3 | Mortgage servicing rights - GNMA loans | Minimum | Discounted Cash Flow | Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.022 0.022
Level 3 | Mortgage servicing rights - GNMA loans | Maximum | Discounted Cash Flow | Discount rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.12  
Level 3 | Mortgage servicing rights - GNMA loans | Maximum | Discounted Cash Flow | Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.121 0.12
Level 3 | Mortgage servicing rights - GNMA loans | Weighted Average | Discounted Cash Flow | Discount rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.08 [1] 0.08 [2]
Level 3 | Mortgage servicing rights - GNMA loans | Weighted Average | Discounted Cash Flow | Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.059 [1] 0.056 [2]
Level 3 | Mortgage servicing rights - BPC MC Trust loans | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 147 $ 215
Level 3 | Mortgage servicing rights - BPC MC Trust loans | Discounted Cash Flow | Discount rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.15 0.15
Level 3 | Mortgage servicing rights - BPC MC Trust loans | Minimum | Discounted Cash Flow | Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.03 0.049
Level 3 | Mortgage servicing rights - BPC MC Trust loans | Maximum | Discounted Cash Flow | Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.756 0.541
Level 3 | Mortgage servicing rights - BPC MC Trust loans | Weighted Average | Discounted Cash Flow | Discount rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.15 [1] 0.15 [2]
Level 3 | Mortgage servicing rights - BPC MC Trust loans | Weighted Average | Discounted Cash Flow | Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.39 [1] 0.365 [2]
[1] Individually evaluated loans requiring specific allowance, net is weighted by collateral value; real estate owned, net is weighted by selling price; loans held for investment at fair value and mortgage servicing rights are weighted by UPB.
[2] Individually evaluated loans requiring specific allowance, net is weighted by collateral value; real estate owned, net is weighted by selling price; loans held for investment at fair value and mortgage servicing rights are weighted by UPB.