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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]      
Assets $ 47,959,883 $ 41,970,021  
Liabilities 41,924,095 36,450,629  
Total liabilities and shareholders' equity 47,959,883 41,970,021  
Bankers Healthcare Group, LLC      
Schedule of Equity Method Investments [Line Items]      
Assets 4,304,835 4,375,643  
Liabilities 3,749,821 3,821,725  
Equity interests 555,014 553,918  
Total liabilities and shareholders' equity 4,304,835 4,375,643  
Revenues 1,175,756 1,110,230 $ 735,506
Income before income taxes and equity in undistributed income of subsidiaries $ 181,326 $ 295,186 $ 241,051