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Equity method investment - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	$ 37,963,000		$ 37,963,000		$ 42,336,000
Amortization of Intangible Assets	2,167,000	$ 2,479,000	4,373,000	$ 4,999,000
Dividends received from equity method investment			49,409,000	7,957,000
Bankers Healthcare Group, LLC
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	7,200,000		7,200,000		$ 7,600,000
Amortization of Intangible Assets	188,000	293,000	376,000	587,000
Accretion income	395,000	541,000	846,000	1,100,000
Dividends received from equity method investment	39,400,000	0	49,400,000	8,000,000.0
Payments to Acquire Loans Held-for-investment	$ 50,300,000	$ 0	$ 124,900,000	$ 0

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