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Equity method investment - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Loans	$ 23,058,461,000		$ 23,058,461,000		$ 22,424,501,000
Technology, trade name and customer relationship intangibles	35,876,000		35,876,000		42,336,000
Amortization of Intangible Assets	2,088,000	$ 2,417,000	6,461,000	$ 7,416,000
Dividends received from equity method investment			66,221,000	47,981,000
Bankers Healthcare Group, LLC
Schedule of Equity Method Investments [Line Items]
Loans	263,200,000		263,200,000		95,800,000
Technology, trade name and customer relationship intangibles	7,000,000		7,000,000		$ 7,600,000
Amortization of Intangible Assets	188,000	293,000	564,000	880,000
Accretion income	349,000	535,000	1,200,000	1,600,000
Dividends received from equity method investment	16,800,000	40,000,000	66,200,000	48,000,000
Payments to Acquire Loans Held-for-investment	$ 75,800,000	$ 50,200,000	$ 200,700,000	$ 50,200,000

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