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Equity method investment - Financial Position and Results of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]          
Assets $ 41,000,118   $ 41,000,118   $ 38,469,399
Liabilities 35,658,006   35,658,006   33,158,792
Total liabilities and shareholders' equity 41,000,118   41,000,118   38,469,399
Bankers Healthcare Group, LLC          
Schedule of Equity Method Investments [Line Items]          
Assets 4,045,386   4,045,386   2,724,542
Liabilities 3,516,645   3,516,645   2,355,256
Equity interests 528,741   528,741   369,286
Total liabilities and shareholders' equity 4,045,386   4,045,386   $ 2,724,542
Revenues 293,427 $ 192,160 829,986 $ 528,767  
Net income $ 80,088 $ 63,280 $ 257,121 $ 184,195