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Fair Value Measurements - Valuation Techniques and Unobservable Inputs Related to Level 3 Assets (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 5,309,971 $ 4,872,017
Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 5,167,617 4,742,898
Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 142,354 129,119
Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 5,309,507 4,871,951
Level 3 | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 5,167,153 4,742,832
Level 3 | Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 142,354 $ 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 0.076 0.076
Level 3 | Minimum | Discounted Cash Flow | Measurement Input, 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 0.005 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 | Measurement Input, 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 0.06 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 0.206 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 0.076 [1] 0.076 [2]
Level 3 | Weighted Average | Discounted Cash Flow | Measurement Input, Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.128 [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 0.091 [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 $ 131,849 $ 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 10,505 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 5,154,508 4,729,869
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 $ 12,485 $ 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 | Measurement Input, 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 | Measurement Input, 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 | Measurement Input, Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.056 [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 $ 160 $ 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 | Measurement Input, Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.039 0.049
Level 3 | Mortgage servicing rights - BPC MC Trust loans | Maximum | Discounted Cash Flow | Measurement Input, Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.639 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 | Measurement Input, Prepayment Rate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mortgage servicing rights, at fair value 0.381 [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.