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Equity method investment - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Mar. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Technology, trade name and customer relationship intangibles | $ 39,349,000 |  | $ 39,349,000 |  | $ 46,161,000 |
Amortization of Intangible Assets | 2,430,000 | $ 2,616,000 | 7,012,000 | $ 7,973,000 |  |
Dividends received from equity method investment |  |  | 49,940,000 | 33,651,000 |  |
Bankers Healthcare Group, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Technology, trade name and customer relationship intangibles | 9,200,000 |  | 9,200,000 |  | $ 10,700,000 |
Amortization of Intangible Assets | 475,000 | 693,000 | 1,400,000 | 2,100,000 |  |
Accretion income | 630,000 | 719,000 | 2,000,000.0 | 2,200,000 |  |
Dividends received from equity method investment | 9,000,000.0 | $ 10,200,000 | 49,900,000 | $ 33,700,000 |  |
Loan face amount | $ 0 |  | $ 0 |  |  | $ 0

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