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Equity method investment - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Loans | $ 23,058,461,000 |  | $ 23,058,461,000 |  | $ 22,424,501,000
Technology, trade name and customer relationship intangibles | 35,876,000 |  | 35,876,000 |  | 42,336,000
Amortization of Intangible Assets | 2,088,000 | $ 2,417,000 | 6,461,000 | $ 7,416,000 |
Dividends received from equity method investment |  |  | 66,221,000 | 47,981,000 |
Bankers Healthcare Group, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Loans | 263,200,000 |  | 263,200,000 |  | 95,800,000
Technology, trade name and customer relationship intangibles | 7,000,000 |  | 7,000,000 |  | $ 7,600,000
Amortization of Intangible Assets | 188,000 | 293,000 | 564,000 | 880,000 |
Accretion income | 349,000 | 535,000 | 1,200,000 | 1,600,000 |
Dividends received from equity method investment | 16,800,000 | 40,000,000 | 66,200,000 | 48,000,000 |
Payments to Acquire Loans Held-for-investment | $ 75,800,000 | $ 50,200,000 | $ 200,700,000 | $ 50,200,000 |

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 + Details
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