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Equity method investment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	$ 22,755		$ 22,755		$ 27,465
Amortization of Intangible Assets	1,558	$ 1,765	4,710	$ 5,339
Dividends received from equity method investment			71,689	33,159
Loans	34,308,310		34,308,310		32,676,091
Proceeds from Sale, Loan and Lease, Held-for-Investment			30,715	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	60	88	178	262
Accretion income	34	43	108	183
Dividends received from equity method investment	24,800	5,600	71,700	33,200
Payments to Acquire Loans Held-for-investment	0	$ 0	0	$ 0
Loans	177,700		177,700		$ 263,000
Proceeds from Sale, Loan and Lease, Held-for-Investment	$ 10,200		$ 30,700

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