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Equity method investment - Narrative (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]          
Technology, trade name and customer relationship intangibles $ 30,981   $ 30,981   $ 34,555
Amortization of Intangible Assets 1,780 $ 2,051 3,574 $ 3,922  
Dividends received from equity method investment     27,592 40,762  
Loans 31,153,290   31,153,290   29,041,605
Bankers Healthcare Group, LLC          
Schedule of Equity Method Investments [Line Items]          
Technology, trade name and customer relationship intangibles 6,100   6,100   6,300
Amortization of Intangible Assets 87 128 174 256  
Accretion income 45 188 140 431  
Dividends received from equity method investment 3,600 28,500 27,600 40,800  
Payments to Acquire Loans Held-for-investment 0 $ 76,000   $ 76,000  
Loans $ 305,200   $ 305,200   $ 350,600