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Equity method investment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	$ 20,007		$ 21,423
Amortization of Intangible Assets	1,417	$ 1,584
Dividends received from equity method investment	24,934	3,601
Proceeds from Sale, Loan and Lease, Held-for-Investment	9,131	0
Financing Receivable, before Allowance for Credit Loss	36,136,746		35,485,776
Bankers Healthcare Group, LLC
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	5,700		5,700
Amortization of Intangible Assets	40	59
Accretion income	29	39
Dividends received from equity method investment	24,900	3,600
Payments to Acquire Loans Held-for-investment	0	0
Proceeds from Sale, Loan and Lease, Held-for-Investment	0	$ 0
Financing Receivable, before Allowance for Credit Loss	$ 147,400		$ 161,700

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