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Fair Value Measurements - Valuation Techniques and Unobservable Inputs Related to Level 3 Assets (Details) $ in Thousands | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total recurring fair value measurements | $ 4,510,978 | $ 2,860,547
Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total recurring fair value measurements | 4,386,522 | 2,780,663
Nonrecurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total recurring fair value measurements | 124,456 | 79,884
Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total recurring fair value measurements | 4,508,370 | 2,860,547
Level 3 | Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total recurring fair value measurements | 4,383,914 | 2,780,663
Level 3 | Nonrecurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total recurring fair value measurements | $ 124,456 | $ 79,884
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 | 0.084
Mortgage servicing rights, at fair value | 0.08 | 0.08
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
Mortgage servicing rights, at fair value | 0.022 | 0.022
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 | 0.004 | 0.001
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 | 0.30
Mortgage servicing rights, at fair value | 0.12 | 0.117
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 | 0.028
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 | 0.089 | 0.105
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 | 0.08
Real estate owned, net | 0.08 | 0.08
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 | 0.084
Mortgage servicing rights, at fair value | 0.08 | 0.08
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 | 0.114 | 0.09
Mortgage servicing rights, at fair value | 0.056 | 0.051
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 | 0.01
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 | 0.009 | 0.01
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 | $ 113,700 | $ 68,000
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 | 10,756 | 11,884
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 | 4,371,317 | 2,766,951
Level 3 | Mortgage Servicing Rights | Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total recurring fair value measurements | $ 12,597 | $ 13,712

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