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Equity method investment - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]          
Technology, trade name and customer relationship intangibles $ 19,506   $ 19,506   $ 21,423
Amortization of Intangible Assets 1,400 $ 1,568 2,817 $ 3,152  
Dividends received from equity method investment     102,157 46,873  
Proceeds from Sale, Loan and Lease, Held-for-Investment     9,131 20,470  
Financing Receivable, before Allowance for Credit Loss 37,105,164   37,105,164   35,485,776
Bankers Healthcare Group, LLC          
Schedule of Equity Method Investments [Line Items]          
Technology, trade name and customer relationship intangibles 5,600   5,600   5,700
Amortization of Intangible Assets 41 59 81 118  
Accretion income 26 35 55 74  
Dividends received from equity method investment 77,200 43,300 102,100 46,900  
Payments to Acquire Loans Held-for-investment 0 0 0 0  
Proceeds from Sale, Loan and Lease, Held-for-Investment 0 $ 20,500 0 $ 20,500  
Financing Receivable, before Allowance for Credit Loss $ 132,100   $ 132,100   $ 161,700