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Equity method investment - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Technology, trade name and customer relationship intangibles | $ 44,713,000 |  | $ 44,713,000 |  | $ 51,130,000
Amortization of Intangible Assets | 2,417,000 | $ 2,430,000 | 7,416,000 | $ 7,012,000 |
Dividends received from equity method investment |  |  | 47,981,000 | 49,940,000 |
Bankers Healthcare Group, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Technology, trade name and customer relationship intangibles | 7,900,000 |  | 7,900,000 |  | $ 8,800,000
Amortization of Intangible Assets | 293,000 | 475,000 | 880,000 | 1,400,000 |
Accretion income | 535,000 | 630,000 | 1,600,000 | 2,000,000.0 |
Dividends received from equity method investment | 40,000,000.0 | 9,000,000.0 | 48,000,000.0 | 49,900,000 |
Payments to Acquire Loans Held-for-investment | $ 50,200,000 | $ 0 | $ 50,200,000 | $ 0 |

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