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Equity method investment - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]          
Technology, trade name and customer relationship intangibles $ 18,108   $ 18,108   $ 21,423
Amortization of Intangible Assets 1,398 $ 1,558 4,215 $ 4,710  
Dividends received from equity method investment     134,644 71,689  
Proceeds from Sale, Loan and Lease, Held-for-Investment     9,131 30,715  
Financing Receivable, before Allowance for Credit Loss 37,932,613   37,932,613   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 40 60 121 178  
Accretion income 21 34 76 108  
Dividends received from equity method investment 32,500 24,800 134,600 71,700  
Payments to Acquire Loans Held-for-investment 0 0 0 0  
Proceeds from Sale, Loan and Lease, Held-for-Investment 0 $ 10,200 0 $ 30,700  
Financing Receivable, before Allowance for Credit Loss $ 117,000   $ 117,000   $ 161,700