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Equity method investment - Narrative (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]          
Technology, trade name and customer relationship intangibles $ 24,313   $ 24,313   $ 27,465
Amortization of Intangible Assets 1,568 $ 1,780 3,152 $ 3,574  
Dividends received from equity method investment     46,873 27,592  
Loans 33,769,150   33,769,150   32,676,091
Proceeds from Sale, Loan and Lease, Held-for-Investment     20,470 117,216  
Bankers Healthcare Group, LLC          
Schedule of Equity Method Investments [Line Items]          
Technology, trade name and customer relationship intangibles 5,800   5,800   6,000
Amortization of Intangible Assets 59 87 118 174  
Accretion income 35 45 74 140  
Dividends received from equity method investment 43,300 3,600 46,900 27,600  
Payments to Acquire Loans Held-for-investment 0 $ 0 0 $ 0  
Loans 204,900   204,900   $ 263,000
Proceeds from Sale, Loan and Lease, Held-for-Investment $ 20,500   $ 20,500