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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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