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Equity method investment - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	$ 41,578,000		$ 41,578,000		$ 46,161,000
Amortization of Intangible Assets	2,271,000	$ 2,659,000	4,582,000	$ 5,357,000
Dividends received from equity method investment			40,914,000	23,433,000
Bankers Healthcare Group, LLC
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	9,700,000		9,700,000		$ 10,700,000
Amortization of Intangible Assets	475,000	693,000	950,000	1,400,000
Accretion income	660,000	729,000	1,300,000	1,500,000
Dividends received from equity method investment	28,200,000	$ 19,100,000	40,900,000	$ 23,400,000
Loan face amount	$ 0		$ 0			$ 0

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