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Equity method investment - Financial Position and Results of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]          
Total assets $ 49,366,969   $ 49,366,969   $ 47,959,883
Total liabilities 43,192,301   43,192,301   41,924,095
Liabilities and Equity 49,366,969   49,366,969   47,959,883
Bankers Healthcare Group, LLC          
Schedule of Equity Method Investments [Line Items]          
Total assets 3,723,436   3,723,436   4,304,835
Total liabilities 3,194,211   3,194,211   3,749,821
Equity interests 529,225   529,225   555,014
Liabilities and Equity 3,723,436   3,723,436   $ 4,304,835
Revenues 228,808 $ 311,333 506,068 $ 613,284  
Net income $ 38,762 $ 57,395 $ 71,565 $ 104,038