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Equity method investment Equity method investment - Financial Position and Results of Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]      
Assets $ 52,589,449 $ 47,959,883  
Liabilities 46,157,568 41,924,095  
Total liabilities and shareholders' equity 52,589,449 47,959,883  
Bankers Healthcare Group, LLC      
Schedule of Equity Method Investments [Line Items]      
Assets 3,784,225 4,304,835  
Liabilities 3,257,078 3,749,821  
Equity interests 527,147 555,014  
Total liabilities and shareholders' equity 3,784,225 4,304,835  
Revenues 931,909 1,175,756 $ 1,110,230
Income before income taxes and equity in undistributed income of subsidiaries $ 129,695 $ 181,326 $ 295,186