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Fair Value Measurements - Valuation of Financial Instruments That are Marked-to-Market on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Trading investments $ 51,963 $ 53,262
Available-for-sale investments 1,775,784 1,933,226
Derivative instruments $ 0 $ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets, Net Other Assets, Net
Liabilities:    
Derivative instruments $ (30) $ (40)
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities
Fair Value Measurements on a Recurring Basis    
Assets:    
Trading investments $ 51,963 $ 53,262
Available-for-sale investments 1,775,784 1,933,226
Derivative instruments 3 0
Total earning assets 1,827,750 1,986,488
Liabilities:    
Derivative instruments (33) (40)
Fair Value Measurements on a Recurring Basis | Level 1     
Assets:    
Trading investments 0 0
Available-for-sale investments 0 0
Derivative instruments 0 0
Total earning assets 0 0
Liabilities:    
Derivative instruments 0 0
Fair Value Measurements on a Recurring Basis | Level 2     
Assets:    
Trading investments 0 0
Available-for-sale investments 1,773,720 1,930,537
Derivative instruments 3 0
Total earning assets 1,773,723 1,930,537
Liabilities:    
Derivative instruments (33) (40)
Fair Value Measurements on a Recurring Basis | Level 3     
Assets:    
Trading investments 51,963 53,262
Available-for-sale investments 2,064 2,689
Derivative instruments 0 0
Total earning assets 54,027 55,951
Liabilities:    
Derivative instruments $ 0 $ 0