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Fair Value Measurements - Quantitations and Assumptions for Fair Value of Assets Serviced by Third Party (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities held to maturity, fair value $ 2,223,622 [1] $ 2,156,694 [2]
Level 3 | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities held to maturity, fair value 3,876 7,146
Level 1 | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities held to maturity, fair value $ 183,536 $ 173,283
Minimum | Level 3 | Fair Value, Measurements, Recurring | Spread to 10 Year Treasury    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Corporate Debt, Measurement Input 3.10%  
Minimum | Level 3 | Fair Value, Measurements, Recurring | Measurement Input, Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Corporate Debt, Measurement Input 7.20%  
Maximum | Level 3 | Fair Value, Measurements, Recurring | Spread to 10 Year Treasury    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Corporate Debt, Measurement Input 8.50%  
Maximum | Level 3 | Fair Value, Measurements, Recurring | Measurement Input, Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Corporate Debt, Measurement Input 12.70%  
Weighted Average | Level 3 | Fair Value, Measurements, Recurring | Spread to 10 Year Treasury    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Volatility 0.055  
Weighted Average | Level 3 | Fair Value, Measurements, Recurring | Measurement Input, Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Volatility 0.097  
[1] Excludes accrued interest receivable of $11.2 million at September 30, 2025 which is recorded in "Other assets" on the condensed consolidated balance sheets
[2] Excludes accrued interest receivable of $13.4 million at December 31, 2024 which is recorded in "Other assets" on the condensed consolidated balance sheets