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Equity method investment - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Technology, trade name and customer relationship intangibles | $ 37,963,000 |  | $ 37,963,000 |  | $ 42,336,000
Amortization of Intangible Assets | 2,167,000 | $ 2,479,000 | 4,373,000 | $ 4,999,000 |
Dividends received from equity method investment |  |  | 49,409,000 | 7,957,000 |
Bankers Healthcare Group, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Technology, trade name and customer relationship intangibles | 7,200,000 |  | 7,200,000 |  | $ 7,600,000
Amortization of Intangible Assets | 188,000 | 293,000 | 376,000 | 587,000 |
Accretion income | 395,000 | 541,000 | 846,000 | 1,100,000 |
Dividends received from equity method investment | 39,400,000 | 0 | 49,400,000 | 8,000,000.0 |
Payments to Acquire Loans Held-for-investment | $ 50,300,000 | $ 0 | $ 124,900,000 | $ 0 |

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