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Equity method investment - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	$ 47,131,000		$ 47,131,000		$ 51,130,000
Amortization of Intangible Assets	2,479,000	$ 2,271,000	4,999,000	$ 4,582,000
Dividends received from equity method investment			7,957,000	40,914,000
Bankers Healthcare Group, LLC
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	8,200,000		8,200,000		$ 8,800,000
Amortization of Intangible Assets	293,000	475,000	587,000	950,000
Accretion income	541,000	660,000	1,100,000	1,300,000
Dividends received from equity method investment	0	28,200,000	8,000,000.0	40,900,000
Loan face amount	$ 0	$ 0	$ 0	$ 0

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