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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]          
Assets $ 46,875,982   $ 46,875,982   $ 41,970,021
Liabilities 41,032,223   41,032,223   36,450,629
Total liabilities and shareholders' equity 46,875,982   46,875,982   41,970,021
Bankers Healthcare Group, LLC          
Schedule of Equity Method Investments [Line Items]          
Assets 4,430,323   4,430,323   4,375,643
Liabilities 3,831,699   3,831,699   3,821,725
Equity interests 598,624   598,624   553,918
Total liabilities and shareholders' equity 4,430,323   4,430,323   $ 4,375,643
Revenues 311,333 $ 297,947 613,284 $ 536,559  
Net income $ 57,395 $ 107,207 $ 104,038 $ 177,033