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Equity method investment - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	$ 54,012,000		$ 56,710,000
Amortization of Intangible Assets	2,698,000	$ 1,196,000
Dividends received from equity method investment	4,324,000	2,450,000
Bankers Healthcare Group, LLC
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	12,700,000		$ 13,400,000
Amortization of Intangible Assets	693,000	832,000
Accretion income	742,000	806,000
Dividends received from equity method investment	4,324,000	$ 2,540,000
Loan face amount	$ 0			$ 0

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+ References

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-Publisher FASB
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